- Hartley Sawyer - Ralph Dibny / Elongated Man
- Brandon McKnight - Chester P. Runk
- Jesse L. Martin - Joe West
- Tom Felton - Dr. Julian Albert
- Jon Cor - Mark Blaine / Chillblaine
- Carlos Valdes - Cisco Ramon / Vibe
- Carlos Valdes - Cisco Ramon
- Carlos Valdes - Cisco Ramon / Mecha-Vibe
- Kayla Compton - Allegra Garcia
- Kayla Compton - Maya
- Rick Cosnett - Eddie Thawne
- Rick Cosnett - Dr. Malcolm Gilmore
- Keiynan Lonsdale - Wally West / Kid Flash
- Keiynan Lonsdale - Wally West
- Ronald Patrick Thompson - Samaritan
- Seth Whittaker - Security Guard
- Christoff Lundgren - Tweaker
- Jana Mitsoula - Detective
- Marc Gaudet - Highway Patrolman
- Natalie Goyarzu - Terrified Woman
- Suzanne Ristic - Tenant
- Emily Bett Rickards - Felicity Smoak
- Jesse Reid - Oswald Loomis
- Robert Knepper - William Tockman / Clock King
- William Sadler - Simon Stagg
- Chris Eastman - Mall Cop
- Jennifer Kitchen - Female Dispacher
- Matthew Robert Kelly - Coroner
- Michael Benyaer - Araz Darbinyan
- Brendon Zub - Kyle
- Sharon Bell - Female Restaurant Patron
- Al Sapienza - Detective Fred Chyre
- Jan Bos - Dr. Harold Hadley
- Austin Dunn - Young Tony
- Casey Dubois - Barista
- Michasha Armstrong - Java
- Evelyn Chew - Woman
- Emily Delahunty - Paige
- Eli Gabay - Fire Chief
- Bruce Harwood - Dexter Myles
- Alex Barima - College Boy
- Anthony Carrigan - Kyle Nimbus / The Mist
- Kelly Frye - Bette Sans Souci / Plastique
- Lucas Wolf - Thug #3
- Mark Hamill - James Jesse / The Trickster
- Philip Cabrita - Man #1
- Jessica Parker Kennedy - Nora West-Allen / XS
- Jessica Parker Kennedy - Mystery Girl
- Michael Reventar - Farooq Gibran / Blackout
- Bre Blair - Tess Morgan
- Greg Finley - Tony Woodward / Girder
- Clancy Brown - General Wade Eiling
- Paul Anthony - Roy G. Bivolo / Rainbow Raider
- Luc Roderique - Jason Rusch
- Roger Howarth - Mason Bridge
- Michael Ironside - Lewis Snart
- Devon Graye - Axel Walker / The Trickster
- Adam Copeland - Al Rothstein / Atom-Smasher
- Birkett Turton - Eddie Slick / Sand Demon
- Franz Drameh - Jefferson 'Jax' Jackson / Firestorm
- Isabella Hofmann - Clarissa Stein
- Nicholas Gonzalez - Dante Ramon
- Nicholas Gonzalez - Dante Ramon / Rupture
- Tom Butler - Eric Larkin
- Casper Crump - Vandal Savage
- Elizabeth McLaughlin - Theresa Howard
- Marco Grazzini - Joey Monteleone / Tar Pit
- Aaron Douglas - Russell Glosson / Turtle
- Teach Grant - Clark Bronwen
- Mathias Retamal - Daniel Burge
- Sean Owen Roberts - Clay Stanley
- Demore Barnes - Henry Hewitt
- Tone Bell - Scott Evans
- Haley Beauchamp - Dr. Tanya Lamden
- Allison Paige - Eliza Harmon / Trajectory
- Haig Sutherland - Griffin Grey
- Shaine Jones - James Zolomon
- Merren McMahon - Johanna
- Joey King - Frankie Kane / Magenta
- Grey Damon - Sam Scudder / Mirror Master
- Greg Grunberg - Tom Patterson
- Christina Brucato - Lily Stein
- Jerry Wasserman - President
- Lisa MacFadden - Anne
- Stephen Huszar - Jared Morillo / Plunder
- Matthew Kevin Anderson - Clive Yorkin
- Andrea Brooks - Eve Teschmacher
- Paul Jarrett - General McNally
- Darren Criss - Music Meister
- Johnny Ghorbani - Raffi
- Nevin Burkholder - Barfly
- Michaela Chalmers - Daughter
- Scott Perrie - Husband
- Donald Heng - Tim Kwon
- Aliza Vellani - Shelia Agnani
- Ryan McDonell - Kurt Weaver
- Michael Karl Richards - Paulson
- Michael Karl Richards - Cop
- Nicholas Bradbury - Dude
- Jonathan Mason - Sweaty Millenial
- Kat Pasion - Charity
- Jason Mewes - Humvee Guy
- Jason Mewes - Jay the Security Guard
- Peter Chao - Millennial
- Bernard Cuffling - Priest #2
- Dominic Purcell - Mick Rory / Heat Wave
- Dominic Purcell - Mick Rory (voice)
- Hannah Drew - Bank Teller
- Michael Girardin - Sweaty Gambler
- Henry Mah - Dealer
- Amitai Marmorstein - Kenny
- Tyler McConachie - Co-Pilot
- Gary Peterman - Security Guard #1
- Jovanna Huguet - Female Realtor
- Amanda Pays - Dr. Tina McGee
- Amanda Pays - Tina McGee (archive footage) (uncredited)
- Marco Darvasi - Uniformed Cop
- Paul Batten - Dr. Ortiz
- Russell Tovey - Ray Terrill / The Ray
- Kendrick Sampson - Dominic Lanse
- Mark Valley - Anton Slater
- Corinne Bohrer - Zoey Clark / Prank
- Bailey Corneal - Detective Addie
- Oliver Rice - Erik Frye
- Bernadette Saquibal - Veronica Dale
- Arturo del Puerto - Edwin Gauss / Folded Man
- Miranda MacDougall - Izzy Bowin
- Kevin Smith - Bob the Security Guard
- Leo Chiang - Yakuza Baddie
- Zachary Gulka - Security Guard
- Patrick Rinehart - A.R.G.U.S. Guard
- Ryan Alexander McDonald - Neil Borman / Fallout
- Kim Suzanne Engelbrecht - Marlize DeVoe / The Mechanic
- Laura Jaye - Moderator
- Christopher Rosamond - Thug
- Panta Mosleh - Peace Corps Volunteer
- Paul Belsito - Thug #2
- Sarah Hayward - Tour Guide
- Robert Mann - Basil Nurblin
- Hugo Steele - Security Guard
- Mike Mitchell - Security Guard
- Travis MacDonald - Tat Man
- Jacky Lai - College Girl
- Chantele Francis - Annoyed Customer
- Michelle Choi-Lee - Teller
- Peter New - Widgick
- Roman Blomme - Street Punk
- Steve Baran - Task Force
- Steve Baran - SWAT Commander
- Jason William Day - SWAT
- Demord Dann - Security Guard
- Thabo Ketshabetswe - Painter
- Gary Pettinger - Restaurant Patron
- Anja Savcic - Young Mother
- David Milchard - Scientist
- James Michalopolous - Security Guard
- Dean Hinchey - Decorator
- James Ralph - Osgood Rathaway
- Lee Shorten - Executive Staffer
- Sarwan Badesha - Cop
- Quynh Mi - Woman
- Micah Joe Parker - Clay Parker
- Scott McNeil - Julius
- Jerry Trimble - Marcus Stockheimer
- J. Douglas Stewart - Fire Chief
- Doug Chapman - City Worker
- Will E. McDonald - Truck Guard
- Tristan Shire - Bartender
- Crystal Mudry - Woman
- Bill Dow - Quentin Quale
- Chase Masterson - Sherry
- Paul Griggs - Jumper
- Wentworth Miller - Leonard Snart / Captain Cold
- Wentworth Miller - Leo Snart / Citizen Cold
- Wentworth Miller - Leonard A.I. (voice)
- Herbert Duncanson - Sergeant Bates
- James Yi - Lead Scientist
- Jenn MacLean-Angus - Surgeon
- Joey Aresco - Frank Santini
- Charlene Luedke - Mrs. Ramon
- Alan Silverman - Consigliere
- Fred Henderson - Coroner
- Arlo Hajdu - Henry
- Anthony Harrison - Warden Wolfe
- Theresa Wong - Lindsay Kang
- Andrew Laurenson - Flasher
- Mathieu Lardier - Maitre D'
- Al Miro - Thief
- Kasey Kieler - Thief
- Martin Novotny - Hannibal Bates
- Katie Cassidy - Laurel Lance / Black Siren
- Katie Cassidy - Laurel Lance / Siren X
- Katie Cassidy - Laurel Lance
- Barbara Wallace - Grandma Bates
- Laiken Laverock - Little Girl
- King Lau - Hulking Man
- Naiah Cummins - Teller
- Ray Boulay - Construction Worker
- Marshall Virtue - TSA Agent
- Paul Moniz de Sa - Jeweler
- Maxine Miller - Old Woman
- Jeremy Schuetze - Rob
- Jessie Fraser - Nurse
- Roger Haskett - Doctor
- Jane Hancock - Mother
- Jason McKinnon - Driver
- Doug Jones - Jake Simmons / Deathbolt
- Isaiah Lehtinen - Kid
- Aaron Craven - Attorney
- Boyan Vukelic - Kendall
- Darla Taylor - Tour Guide
- Vanessa Williams - Francine West
- Brad Dryborough - David Rutenberg
- Warren Abbott - Desk Guard
- Serge Jaswal - Suit
- Jenna Berman - McGee's Assistant
- Lisa Marie DiGiacinto - News Anchor
- Greg Kean - Supervisor
- Simon C. Hussey - Security Guard
- Shantel VanSanten - Patty Spivot
- Harry Han - Tech
- Anna Hopkins - Samantha Clayton
- Michael St. John Smith - Harbor Police Chief
- David Allan Pearson - Captain
- Jason Bell - Goon #1
- Jason Bell - Uniformed Cop
- Jason Bell - Cop
- Cody Davis - Brat
- Zain Meghji - Announcer
- Zain Meghji - Reporter
- Andres Joseph - Turbo
- Chris Webb - Criminal Driver
- Chris Webb - Trusting Man Face
- Chris Webb - David Hersh
- Nadeen Lightbody - Reporter
- William Samples - Mr. Vandervoort
- Melise - Linda Park
- Melise - Linda Park / Dr. Light
- Katie Hayashida - Cell Phone Girl
- Romuald Hivert - Cop
- Reese Alexander - Museum Guard
- Reese Alexander - Prison Guard #2
- Spencer Graham - A.R.G.U.S. Agent
- Sylvesta Stuart - Technician
- Peter Brown - McKay
- Guy Christie - Cop
- Tatyana Forrest - Ashley Zolomon
- Octavian Kaul - Young Hunter Zolomon
- Valerie McNicol - Caretaker
- Chad Riley - Foreman
- Chad Riley - Goon #2
- Chad Riley - Security Guard
- Anesha Bailey - Cop
- Amy Goodmurphy - Tara
- Gary Hetherington - Pastor
- Kiana Madeira - Spencer Young
- Judith Maxie - Theresa Merkel
- Rob Compton - Police Officer #1
- Rob Compton - Detective Rowell
- Derek Kwan - Uniformed Cop
- Matty Finochio - Bruno Moretti
- Jeremy Jordan - Grady
- Jeremy Jordan - Winn Schott
- Erin Cummings - Vanessa Jansen / Block
- Evan Spergel - Bobby Moretti
- Dion Riley - Officer Matthews
- Jeremy Davies - John Deegan
- Cassandra Ebner - Raelene Sharp
- Liam McIntyre - Mark Mardon / Weather Wizard
- Tony Todd - Zoom (voice)
- Troy Rudolph - Paramedic 2
- Troy Rudolph - Paramedic #2
- Gabrielle Walsh - Raya Van Zandt / Silver Ghost
- Charlene Amoia - Miss Pellett
- Britne Oldford - Shawna Baez / Peek-a-Boo
- Rochelle Okoye - Keisha Moore
- Zibby Allen - Dr. Tanya Lamden
- Dan Payne - Shay Lamden
- Megan Helbing - Megan the Barista
- Jerry Yang - Ian the Patron
- Catherine Lough Haggquist - Vickie Bolen
- Bill Goldberg - Big Sir / David P. Rachet
- Tom Cavanagh - Harrison 'Harry' Wells
- Tom Cavanagh - Harrison Wells
- Tom Cavanagh - Harrison 'H.R.' Wells
- Tom Cavanagh - Harrison 'Sherloque' Wells
- Tom Cavanagh - Harrison 'Nash' Wells
- Tom Cavanagh - Eobard Thawne / Reverse-Flash
- Tom Cavanagh - Dr. Harrison Wells
- Tom Cavanagh - Eobard Thawne
- Tom Cavanagh - Eobard Thawne / Reverse-Flash / Timeless Wells
- Tom Cavanagh - Eobard Thawne / Reverse-Flash / The Flash
- Tom Cavanagh - Various Versions of Harrison Wells
- Tom Cavanagh - Harrison Wells / Timeless Wells
- Tom Cavanagh - Eobard Thawne / Reverse-Flash / Negative Reverse-Flash
- Kathryn Gallagher - Lia Nelson
- Alex Désert - Julio Mendez
- Ryan Handley - Godspeed
- Peter Hall - Vincent Santini
- Emily Kinney - Brie Larvan / Bug-Eyed Bandit
- Reina Hardesty - Joss Mardon / Weather Witch
- Richard Brooks - Warden Gregory Wolfe
- Atlin Mitchell - Woman
- Atlin Mitchell - Nina
- Amy Pietz - Debbie Dibny
- Fulvio Cecere - Officer Vukuvich
- Kindall Charters - August Heart
- Danny Trejo - Breacher
- Kimberly Williams-Paisley - Renee Adler
- Sarah Carter - Grace Gibbons / Cicada II
- Peyton List - Lisa Snart / Golden Glider
- Peyton List - Lisa Snart
- Matt Ellis - Agent Zak Zeal
- Carlo Rota - Remington Meister
- Rebecca Finch - Idna
- Fraser Aitcheson - Prison Gang-Goon #1
- Fraser Aitcheson - City Worker
- Fraser Aitcheson - Criminal Passenger
- Tyler Hoechlin - Clark Kent / Superman
- Jon Cryer - Lex Luthor
- Caity Lotz - Sara Lance / White Canary
- Elizabeth Tulloch - Lois Lane
- Sean Kohnke - Bratva Leader
- Sean Kohnke - Police Officer #1
- Sean Kohnke - Armed Guard (uncredited)
- Matt Ryan - John Constantine
- Tom Ellis - Lucifer Morningstar
- Stephen Lobo - Jim Corrigan / The Spectre
- Meera Simhan - Rachel Rosso
- Ashley Scott - Helena Kyle / Huntress
- LaMonica Garrett - Mar Novu / The Monitor
- David Harewood - J'onn J'onzz / Martian Manhunter
- Dina Meyer - Barbara Gordon / Oracle (voice) (uncredited)
- Tyson Arner - Emerson Fairweather
- David Sobolov - Gorilla Grodd (voice)
- Keith David - Solovar (voice)
- Briana Tedesco - Young Maya
- Silver Kim - John Loring
- Vanessa Walsh - Frida Novikov / Turtle-2
- Andy Mientus - Hartley Rathaway / Pied Piper
- BD Wong - Godspeed (voice)
- Joel Semande - Roderick Smith
- Phil LaMarr - Rag Doll (voice)
- Sendhil Ramamurthy - Dr. Ramsey Rosso / Bloodwork
- Troy James - Peter Merkel / Rag Doll
- Eric Nenninger - Joseph Carver
- Everick Golding - Trevor Shinick
- Everick Golding - Corrections Officer
- Olivia Cheng - Linda Park
- Jason Wong - Police Officer #1
- Brittany Alexis Palmer - Police Officer #2
- Stephen Ogden - Police Officer #3
- Linnea Currie-Roberts - Female Uni
- Mark Brandon - Richard Dearbon
- Brad Abramenko - Guard #1
- Frances Leigh - Alice Lee
- Connor Parnall - Volunteer
- Mitra Suri - Amélie
- Melissa Benoist - Kara Danvers / Supergirl
- Melissa Benoist - Kara Danvers / Supergirl / Overgirl
- Kaare Anderson - Middle-Aged Man
- Lili Beaudoin - Young Woman
- Nyla Alleyne - Teenager
- Pavia Sidhu - Grunge Girl
- Sam Krochmal - Parker
- Randall Hua - Jock
- Zavien Garrett - Reggie
- Donna Soares - Judge Tanaka
- Donny Lucas - Chip Cooper
- Liz Wallace - Sign Language Interpreter
- Vivin Oommen - Secondary Council
- Alistair Abell - ER Doctor
- Yoshie Bancroft - Nurse #2
- Jennifer Cheon - Paramedic 1
- Gigi Jackman - Bank Teller
- Dee Jay Jackson - Laundry Guy
- Nelson Leis - Scraggly Witness
- Dagan Nish - Junkie
- Gerald Paetz - Curtis
- Jane Craven - Rachel Rathaway
- Mathew Yanagiya - Man
- Naomi King - Woman
- Monice Peter - Police Officer #1
- Anthony Shim - Police Officer #2
- Andrew Gillingham - Crook
- Peter Bryant - Fire Chief
- Michael Brian - Suit
- David Hayter - King Shark (voice)
- Austin Anozie - Teammate #2
- Cainan Wiebe - Teammate #1
- Kirby Morrow - Coach
- Chris Robson - Tech
- Falk Hentschel - Carter Hall / Hawkman / Prince Khufu
- Jona Xiao - Carrie Bates / Rainbow Raider
- Audrey Marie Anderson - Lyla Michaels
- Audrey Marie Anderson - Lyla Michaels / Harbinger
- Michael Rowe - Detective Floyd 'Deadshot' Lawton
- Logan Williams - Young Barry Allen
- Logan Williams - Young Barry (archive footage) (uncredited)
- Mike Carpenter - Thug #1
- Jeff Sanca - Cop
- Jeff Sanca - Star Labs Security Guard
- Jeff Sanca - Security Guard
- Benjamin Arcé - Guard
- Ricky He - Patron #1
- Brian McBride - CPS Man
- Rhys Williams - Man
- Michele de Broel - Barricade Cop
- Andy Nez - Brent Osmack
- Andy Nez - Plant Foreman
- Lillian Doucet-Roche - Attractive Woman
- Ian Farthing - CFO
- Dimitry Tsoy - Uniformed Cop
- Peter Flemming - John James
- Kathryn Dobbs - Karen Kane
- Jonathan Maniraho - Maitre D'
- Bethany McNab - Employee
- Zenaida Telfair - Nurse
- Dalias Blake - Tough #2
- Thomas Cadrot - Nigel
- Briana Rayner - Receptionist
- Devina Briggs - Child
- Devielle Johnson - Task Force #1
- John Barrowman - Malcolm Merlyn
- John Barrowman - Cutter Moran
- Ash Lee - Stock Broker
- Beau Daniels - Priest
- Beau Daniels - Elderly Orloff
- Willa Holland - Thea Queen / Speedy
- Taylor St. Pierre - Acolyte
- Donnelly Rhodes - Agent Smith
- Linda Ko - NSA Official
- Robin Atkin Downes - Dominator (voice)
- Chantal Bui Viet - Danielle
- Jessica Camacho - Gypsy
- Jason Hunt - Father
- Ava Julien - Officer Kim
- Blair Penner - Craig
- Blair Penner - Acolyte Craig
- Brandy Le - Aircraft Marshaler
- Olena Medwid - Olga
- Paul Almeida - Officer #1
- Paul Almeida - Uniform Cop
- Rhianna Jagpal - 2nd Cheerleader
- Adam Kozlick - Gang Member
- Bri Neal - Head Cheerleader
- Tobin Bell - Savitar (voice) (uncredited)
- Tobin Bell - Doctor Alchemy / Savitar (voice) (uncredited)
- Tobin Bell - Doctor Alchemy (voice) (uncredited)
- Tobin Bell - Savitar (voice)
- James Neate - Lazarus
- Caitlin Stryker - Laura Stone
- Arpad Balogh - Robber
- Quinn Bui - Soldier
- Keith Silverstein - Gorilla Vocal Effects (voice)
- Chris Wood - Mon-El / Tommy Moran
- Chris Cound - Mugger
- Chris Cound - Father
- Carmela Sison - Nurse Beth
- Richard Zeman - Lucius Coolidge / Heat Monger
- Liam Hughes - Young Barry
- Sasha Rojen - Young Iris
- Austin Eckert - ARGUS Agent
- Larry Hoe - Government Official
- Anne Dudek - Tracy Brand
- Victor Garber - Dr. Martin Stein
- Victor Garber - Prof. Martin Stein (voice)
- Victor Garber - Digsy's Husband
- Matt Afonso - Weeper
- Donna Pescow - Dr. Sharon Finkel
- Emmanuel Amadeo Badal - Guard #1
- Matthew James Dowden - Christoph Banks
- Tracy Trueman - Dr. Foster
- Shayn Walker - Police Armorer
- Paul Blackthorne - Quentin Lance
- Juliana Harkavy - Dinah Drake / Black Canary
- Robbie Amell - Ronnie Raymond / Firestorm
- Robbie Amell - Ronnie Raymond / Deathstorm
- Robbie Amell - Ronnie Raymond / Deathstorm (voice)
- Tiffani Timms - Reporter #1
- Tiffani Timms - Tiffany Smith
- Trevor Carroll - Max Mercury
- Trevor Carroll - Street Punk
- Brian Cook - Nazi
- Brett Alexander Davidson - Nazi Facility Guard
- Nickolas Baric - Security Guard
- Nickolas Baric - Security Guard #1
- Nickolas Baric - Thug #2
- Frederick Schmidt - Metallo-X (voice)
- Mercedes De La Cruz - Upper Class Woman
- Bill McNaughton - Jury Foreman
- Katherine McNamara - Mia Queen / Green Arrow
- Katherine McNamara - Mia Smoak
- Quinnie Vu - Bank Teller
- Corina Bizim - Pizza Delivery Woman
- Ben Diskin - Beebo (voice)
- Sean Millington - Prison Gang Leader
- Sonia Beeksma - Reporter
- Sonia Beeksma - KPJT Reporter
- Sonia Beeksma - News Reporter
- Sonia Beeksma - News Anchor
- Paul McGillion - Earl Cox
- Dana Stoutenburg - Naomi Norris
- Jaren Moore - Plumber
- Andrew Robert Wilson - Chinese Food Delivery Man
- Tommy Europe - Security Guard
- Vito D'Ambrosio - Mayor Anthony Bellows
- Kendall Cross - Mayor Van Buren
- Kallie Hu - Tour Guide
- Joel Stephanson - Blimp Pilot
- Raj Lal - Driver
- Max Adler - Jaco Birch / The Hotness
- Max Adler - Jaco Birch
- Mikael Vierge - Crucifer
- Andre Tricoteux - Savitar
- Andre Tricoteux - Carl Bork
- Andrew Barber - Hippie Guy
- Joel Wirkkunen - Bus Driver
- Georgie Daburas - Lucas Sharpe
- Bruce Crawford - Security Guard #2
- Bruce Crawford - JP Chipera
- Mat Lo - Caleb Fairweather
- Sean Poague - Accelerated Man
- Adil Zaidi - A.R.G.U.S. Scientist
- Nathan Barrett - Pizza Dude
- Samantha Hum - Technician
- Neil Sandilands - Clifford DeVoe / The Thinker
- Melissa Bradsen - Flight Attendant
- Devon Ferguson - Cop
- Chad Bellamy - Prison Gang-Goon #2
- Chad Bellamy - Goon #1
- Adrian Neblett - Shotgun SWAT
- Russell Jung - Briefcase Guy
- Seth Ranaweera - Co-Worker #1
- Daniel Cudmore - Gridlock
- Carlo Marks - William Seaver
- Malaika Jackson - Rene Carpenter
- Malaika Jackson - Dr. Rene Carpenter
- Ashley Ross - Natalie
- Alex Rose - Vance Brandon
- Julianne Christie - Warden Del Toro
- Natalie Gibson - Principal Palizzi
- Leana Yu - Female Newscaster
- Benita Ha - Paramedic #1
- Chad Rook - Clyde Mardon
- Islie Hirvonen - Grace Gibbons
- Paul Lazenby - Tech Thief #2
- Angela Vanderwal - Heckler
- Ruby Rose - Kate Kane / Batwoman
- Kheon Clarke - Cop
- John Wesley Shipp - Henry Allen
- John Wesley Shipp - Jay Garrick / The Flash
- John Wesley Shipp - Barry Allen / The Flash (Earth 90)
- Braedon Cox - Businessman
- Aaron Joseph - Senior Agent
- Sabrina Miniaci - Female Cop
- Marc Anthony Williams - Uniform Cop
- Jennifer Oleksiuk - Female Meta-Human
- Karin Inghammar - Female Social Worker
- Jesse Stretch - Truck
- Klarc Jerome Wilson - Officer Jones
- Lossen Chambers - Dr. Vanessa Ambres
- John Gillich - Philip Master
- Malia Baker - Alice Bolen
- Michael Edwards - Man
- Stephanie Florian - Woman
- Helenna Santos - Nurse Shelley
- Sugar Lyn Beard - Becky Sharpe / Hazard
- Sugar Lyn Beard - Becky Sharpe / The Thinker
- Sugar Lyn Beard - Becky Sharpe
- Chris Shields - John Bolen
- Ese Atawo - Detective Frankie Curtis
- Fraser Corbett - Bank Guard
- Garry Garneau - Uni #1
- Andy Thompson - Dr. Bruce Bonwitt
- Adam Bergquist - Randolf Morgan
- Quentin Schneider - McCulloch Guard #2
- Eric Schweig - General Cloud
- Khamisa Wilsher - McCulloch Guard #1
- Nilo Ghajar - Visitor #2
- Nilo Ghajar - Guard
- Aliya Boulanger - Female Uni
- Janet Glassford - Surly Meta
- Kareem Malcolm - Male Uni
- Shawn Orr - Short Meta
- Michael Roselli - Large Meta
- Anna Louise Sargeant - Meta Wife
- Mark Alastair - IHP Guard #1
- Tim Zhang - Anxious Meta
- Chris Klein - Orlin Dwyer / Cicada
- Gerry South - Night Manager
- Ken Camroux-Taylor - Judge Hankerson
- Mark Sweatman - Norvock
- Neil Webb - Gat
- Shawn Stewart - Mitch Romero
- Shane Symons - Player #2
- Gardiner Millar - Tony Rawlins
- James Rha - Dr. Rodrigo
- Kailey Spear - Terrified Civilian 1
- Sam Spear - Terrified Civilian 2
- Brandon Routh - Ray Palmer / The Atom
- Brandon Routh - Ray Palmer / The Atom / Clark Kent / Superman
- Brandon Routh - Ray Palmer
- Ryan Minaker - Blood Brother (uncredited)
- Kyle Secor - Thomas Snow / Icicle
- Gary Starkell - Riggs Wellington
- David Dastmalchian - Philippe / Abra Kadabra
- Arran Henn - Catco Reporter
- Sam Smith - Citizen #2
- Bethany Brown - Janet Petty / Null
- Sean Carey - Stanley Ellis
- Dominic Burgess - Ramsey Deacon / Kilgore
- Jarryd Baine - Channel 52 News Reporter
- Bobby Magee - Older Attendant
- Derek Mears - Sylbert Rundine / Dwarfstar
- Marcus Aurelio - Guard #1
- Rodrigo Massa - Waiter
- Chelsea Kurtz - Mina Chaytan / Black Bison
- Todd Lasance - Edward Clariss / The Rival
- Phillip Mitchell - Security Guard
- Kyle Strauts - Lars Patel
- Darryl Quon - Skullstar
- Jonathon Young - Dr. Olsen
- Efrat Dor - Eva McCulloch / Mirror Monarch
- Brian Johnston - Bank Manager
- Tess Atkins - Natalie
- Garland Chang - Thug #1
- Sasha Piltsin - Bodyguard
- Erika Soto - Ultraviolet (voice)
- Julian Black Antelope - Adam Creyke
- David Ramsey - John Diggle / Spartan
- Leonardo Nam - Matthew Kim / Melting Point
- Eduard Witzke - Sterling Brooks
- Eduard Witzke - Robber
- Rebecca Roberts - January Galore
- Elizabeth Weinstein - Financial Advisor
- Matt Kennedy - Frightened Man (uncredited)
- Wren Walker - Guard
- Nancy Hillis - Penelope Dearbon
- William MacDonald - Gene Huskk
- Andrew J. Hampton - Maurice
- Leanne Buchanan - Outdoor Cart Barista
- Leanne Buchanan - Hostage #2
- Stephen Amell - Oliver Queen / Green Arrow
- Stephen Amell - Oliver Queen / Green Arrow / Dark Arrow
- Stephen Amell - Oliver Queen / Green Arrow / The Spectre
- Darcy Hinds - McCulloch Guard
- Meena Mann - News Anchor
- Meena Mann - Anchor
- Conor Wylie - Reporter 2
- Karan Oberoi - August Heart / Godspeed
- Carlo Fortin - FBI Agent
- Katee Sackhoff - Amunet Black / Blacksmith
- Victoria Park - Kamilla Hwang
- Victoria Park - Mirror Kamilla Hwang
- Victoria Park - Kamilla Hwang / Mirror Kamilla Hwang
- Jessica Lee - Arielle Boyd
- Rick D. Wasserman - Prisoner Godspeed (voice)
- Cress Williams - Jefferson Pierce / Black Lightning
- Osric Chau - Ryan Choi
- Shaun Omaid - Jered Haywood
- Emily Schoen - Nerdy Patron #1
- William Fielding - Nerdy Patron #2
- Matt Letscher - Eobard Thawne / Reverse-Flash
- Matt Letscher - Eobard Thawne
- Malcolm Masters - Guard #3
- Kandyse McClure - Xotar
- Josh Dohy - Man in Bed
- Paul Herbert - Director Hackshaw
- Kalvin Olafson - Security Chief
- Chyler Leigh - Alex Danvers
- Chyler Leigh - Alex Danvers / Sentinel
- Lisa Chandler - Hazmat Woman
- Courtney Ford - Nora Darhk (archive footage)
- Courtney Ford - Nora Darhk
- Ryan Jefferson Booth - King
- Piper Curda - Avery Ho
- Tony Curran - Despero
- Megan Peta Hill - Wanda Wayland / Ten
- Megan Peta Hill - Ten
- Finn Michael - Hankshaw
- Andres Soto - Marcus
- Andres Soto - Marcus (uncredited)
- Anthony Joseph - Carver
- Romeo Reyes - Carjacker
- Damion Poitier - Keith / Goldface
- Robert Picardo - Dexter Myles
- Robert Picardo - Dexter Myles (voice)
- Drew G. Sicard - Jogger
- Lauren Jackson - Donna Winters
- Nicholas Elia - Harold Birch
- Tavia Cervi - Rose Levin
- Jag Bal - Stan Mullen
- Amanda Khan - Jude Washington
- Elyse Maloway - Female Camper
- Alex Stines - Male Camper
- Patrick Keating - Older Man
- Alexa Barajas - Esperanza Garcia / Ultraviolet
- Milton Barnes - Quincy P. Runk
- Susan Walters - Dr. Carla Tannhauser
- Natalie Dreyfuss - Sue Dearbon
- Michelle Harrison - Nora Allen
- Michelle Harrison - Speed Force Nora
- Michelle Harrison - Joan Williams
- Michelle Harrison - Joan Williams / Speed Force Nora
- Michelle Harrison - Nora Allen (voice)
- Stephanie Izsak - Officer Daisy Korber
- Stephanie Izsak - Captain Daisy Korber
- Stephanie Izsak - Uni #1
- Debbie Podowski - DA Strong
- Behtash Fazlali - Jamal
- Derrick DeVilliers - Mugger
- Derrick DeVilliers - Shady Man at Jitters
- Sarah Surh - Kamiko
- Carmen Moore - Kristen Kramer
- Natalie Sharp - Millie Rawlins / Sunshine
- Lindy Booth - Vanya
- Shayan Bayat - Aariz Mousa
- Kaitlyn Santa Juana - Lydia Sanchez
- Emmie Nagata - Dr. Kimiyo Hoshi / Dr. Light
- Jessica Barrera - Young Woman
- Daniel Letto - Bank Teller
- Dan Ginnane - Bank Robber #2
- Barbara Patrick - Bank Robber #3
- Patrick Sabongui - David Singh
- Patrick Sabongui - Mirror Chief David Singh
- Violett Beane - Jesse Wells
- Violett Beane - Jesse Wells / Jesse Quick
- Morena Baccarin - Gideon (voice) (uncredited)
- Douglas Armstrong - CCPD Officer #1
- Coulton Jackson - CCPD Officer #2
- Curtis Braconnier - Jewel Thief
- Javicia Leslie - Ryan Wilder / Batwoman
- Javicia Leslie - Ryan Wilder / Red Death
- Javicia Leslie - Ryan Wilder / Red Death / Batwoman
- Maggie Sullivun - Elderly Woman
- Rachel Drance - Taylor Downs
- Daylin Willis - IVO Employee
- Neal McDonough - Damien Darhk
- Ashley Rickards - Rosalind Dillon / Top
- Jordan Fisher - Bart Allen / Impulse
- Ciara Renée - Kendra Saunders
- Ciara Renée - Kendra Saunders / Hawkgirl
- Agam Darshi - Mona Taylor / Queen
- Mika Abdalla - Tinya Wazzo
- Kausar Mohammed - Dr. Meena Dhawan / Fast Track
- Sara Alicia Garcia - Alexa Rivera / Fuerza
- Sara Alicia Garcia - Alexa Rivera / Fuerza / Negative Alexa Rivera
- Sara Alicia Garcia - Negative Alexa Rivera
- Ennis Esmer - Bashir Malik / Psych
- Ennis Esmer - Bashir Malik / Psych / Negative Bashir Malik
- Ennis Esmer - Negative Bashir Malik
- Meghan Gardiner - Renee Wazzo
- Richard Harmon - Owen Mercer / Captain Boomerang
- Josh Chambers - Joseph Monteleone / Tar Pit
- Magda Apanowicz - Andrea Wozzeck / The Fiddler
- Alexandria Wailes - Michelle Amar / Murmur
- Rebecca Husain - Chef Annabelle
- Mark Krysko - Security Guard #1
- Adina Insley - Jenna Marie West
- Nicole Maines - Nia Nal / Dreamer
- Gabrielle Kaur Cheema - Officer #1
- Andrew Francis - Tony Stewart
- Drew Henderson - Dom Stewart
- Charles Zuckermann - Bert
- Sandra Shapiro - Waitress
- Lily Yawson - Original Dreamer
- Dave McGowan - O'Shaughnessy's Customer #1
- Sarah Ferguson - O'Shaughnessy's Customer #2
- Aleksandra Cross - O'Shaughnessy's Customer #3
- Hunter Golden - O'Shaughnessy's Customer #4
- Asia Mattu - O'Shaughnessy's Customer #6
- Dreyden Free - O'Shaughnessy's Customer #7
- Diana Bang - Inspector Tao / Lady Chronos
- Peter Kelamis - Inspector Howard
- Natalie Moon - Jane
- Harrison MacDonald - Mold Inspector Rogen
- Jojo Ahenkorah - Security Guard
- Elodie Venece - Dr. Rachel Rosso
- Tim Howe - Security Guard
- Charles Jarman - Officer
- Robbie Segulam - Security Guard
- Alexander Moonie - Marco
- Teana-Marie Smith - Dr. Lockett
- Hana Huggins - Jess Chambers
- Teddy Sears - Jay Garrick
- Teddy Sears - Hunter Zolomon / Zoom
- Teddy Sears - Jay Garrick / Zoom
- Teddy Sears - Jay Garrick / Hunter Zolomon
- Roraigh Falkner - Corbin Taft Security Guard (uncredited)
- Chris Wood - Electrical Inspector Dupree
- Jess Carson
- Emily Palizzi
- Dan Fisk
- David Rapaport
- Jonathan Butler
- Eric Wallace
- Thomas Pound
- Lyndsey Baldasare
- Catou Kearney
- Blake Neely
- Justin Kohler
- Aaron Levy
- Nathaniel Blume
- Season Kent
- Michael Mullane
Mark Hamill interpreta a James Jesse / The Trickster en la serie.
Jeremy Davies interpreta a John Deegan en la serie.
Dina Meyer interpreta a Barbara Gordon / Oracle (voice) (uncredited) en la serie.
Tobin Bell interpreta a Savitar (voice) en la serie.
Wentworth Miller interpreta a Leonard A.I. (voice) en la serie.
Neal McDonough hace el papel de Damien Darhk.
Tony Curran hace el papel de Despero.
Vito D'Ambrosio interpreta a Mayor Anthony Bellows en la serie.
Grant Gustin interpreta a Barry Allen / The Flash en la serie.
Candice Patton interpreta a Iris West-Allen en la serie.
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