- Staz Nair - William Dey
- Peta Sergeant - Nyxlygsptlnz / 'Nyxly'
- Odette Annable - Samantha Arias / Reign
- Sam Witwer - Ben Lockwood / Agent Liberty
- Chris Wood - Mon-El
- Calista Flockhart - Cat Grant
- Mehcad Brooks - James 'Jimmy' Olsen / Guardian
- Dean Cain - Jeremiah Danvers
- Owain Yeoman - Vartox
- Peter Facinelli - Maxwell Lord
- Rich Ceraulo Ko - Agent Hartmann
- Eric Steinberg - Commander Gor
- Jenna Dewan - Lucy Lane
- Chris Browning - Ben Krull / Reactron
- Levi Miller - Carter Grant
- Scott Michael Campbell - Ethan Knox
- Robert Gant - Zor-El
- Faran Tahir - The Commander
- Ben Begley - Tobey
- Derek Mio - Hayashi
- Chris Vance - Non
- Brit Morgan - Leslie Willis / Livewire
- Glenn Morshower - General Sam Lane
- Joan Juliet Buck - Katherine Grant
- Luke Macfarlane - Agent Donovan
- Charles Halford - Jemm
- Peter MacKenzie - Dirk Armstrong
- Aaron Lustig - Lawyer #1
- René Ashton - Lawyer #2
- Jeannine Cota - KNOC Newscaster
- Dar Dixon - Board Member #1
- Tawny Cypress - Senator Miranda Crane
- Blake Jenner - Adam Foster
- Ric Sarabia - Alien Soldier
- Emma Caulfield Ford - Cameron Chase
- Frank Maharajh - Police Officer
- Daniel DiMaggio - Kal-El
- Jeff Branson - Carl Draper / Master Jailer
- Laura Vandervoort - Indigo
- Patrick O'Connell - General Mathers
- Todd Sherry - Professor Alphonse Luzano
- Blake Berris - Gabriel Phillips
- Ray Campbell - Detective Warren
- Eddie McClintock - Col. James Harper
- Aisha Tyler - Aisha Tyler
- Julie Chen Moonves - Julie Chen
- Sara Gilbert - Sara Gilbert
- Sharon Osbourne - Sharon Osbourne
- Sheryl Underwood - Sheryl Underwood
- Eve Torres - Maxima
- Harriet Sansom Harris - Sinead
- Frederick Schmidt - John Corben / Metallo
- Rich Ting - Dr. Gilcrist / Metallo 2
- Ian Gomez - Snapper Carr
- Dichen Lachman - Veronica Sinclair / Roulette
- Ian Casselberry - Quill
- John DeSantis - Draaga
- Alexander Cendese - Chet Miner
- William Mapother - Dr. Rudy Jones / Parasite
- Nikohl Boosheri - Kelly Sotto
- Jason Gray-Stanford - Rand O'Reilly
- Victor Zinck Jr. - Phillip Karnowsky
- Harley Quinn Smith - Izzy Williams
- James Urbaniak - Maaldorian Doctor
- Steve Valentine - Mad Scientist
- Jessie Graff - Lisa Gold
- Marci T. House - Dr. Hampton
- Terrell Tilford - Armek
- Peter Gadiot - Mr. Mxyzptlk
- Tamzin Merchant - Lyra Strayd
- Darren Criss - Music Meister
- Teri Hatcher - Rhea
- Kevin Sorbo - Lar Gand
- Johnny Ghorbani - Derrick Simmons
- Claudia Doumit - Beth Breen
- David Hoflin - Rick Malverne
- Gregg Henry - Peter Thompson
- Lonnie Chavis - Marcus
- Mark Gibbon - General Zod
- Robyn Ross - Mom
- Adrian Pasdar - Morgan Edge
- David St. Louis - Robert DuBois / Bloodsport
- Jeremy Burtenshaw - Gunner
- Gelsea Mae - Staffer #2
- Marc Senior - Staffer #1
- Amanda May - Pilot 1
- Yael Grobglas - Gayle Marsh / Psi
- Carlos Bernard - Oscar Rodas
- Dewshane Williams - Till'all
- Emily Bett Rickards - Felicity Smoak
- Danielle Nicolet - Cecile Horton
- Keiynan Lonsdale - Wally West / Kid Flash
- Jesse L. Martin - Joe West
- Candice Patton - Iris West
- Dominic Purcell - Mick Rory / Heat Wave
- Patrick Sabongui - Captain David Singh
- Victor Garber - Dr. Martin Stein
- Franz Drameh - Jefferson "Jax" Jackson / Firestorm
- Derick Agyemang - Security Guard #1
- Nicole Anthony - Female Customer
- Ken Godmere - Male Customer
- Chelsea Gill - Bank Teller
- David Lennon - Cop
- Norman Misura - Crane Operator
- Angela Moore - Principal Coburn
- Louriza Tronco - N'keyy
- Sage Brocklebank - Guard
- David Carzell - Kenneth
- Nick Fontaine - Josh
- Cameron Forbes - Chief
- Hyuma Frankowski - Jeremy
- Meghan Gardiner - Soccer Mom
- Khaira Ledeyo - Vice Principal
- Alex Zahara - Little Kryptonian Man
- Emy Aneke - Shiv
- Shauna Hansen - Jen
- Octavian Kaul - Luke
- Robert Parent - Pilot
- Ivan Mok - Kenny Li
- Eliana Jones - Josie
- Carolyn Anderson - Gym Teacher
- Mik Byskov - Samuel Bernard
- Ryleigh Gillespie - Cheerleader
- Gavin Langelo - Jake
- Zenia Marshall - Student One
- Joshua Morettin - Preppy Kid
- Austin Anozie - Student Two
- C. Douglas Quan - Mr. Li
- Sandy Sidhu - Deputy Clemens
- Farryn VanHumbeck - Vicki
- Georgia Hacche - Woman
- Andres Joseph - Man
- Robyn Bradley - Wedding Planner
- Paul Herbert - Scientist
- Jessica Parker Kennedy - Caterer
- Luke Roessler - Boy
- Christina Brucato - Lily Stein
- Isabella Hofmann - Clarissa Stein
- William Katt - Minister
- Anthony Ames - Angry Boss
- Mackenzie Gray - Greggor
- Andrea Pizarro - Manicurist
- Jeremy Schuetze - Rob
- Chris Walters - Norman Guard
- Sarah Douglas - Jindah Kol Rozz
- Hayley Sales - Emily
- Brooke Smith - Jacqueline Nimball
- Bob Frazer - Angry Father
- Bob Frazer - Roger Hayden / Psycho-Pirate
- Gaalen Engen - Officiant
- Herbert Duncanson - Male Passenger
- Andrew Nadanyi - DEO Agent
- Laurie Metcalf - Mary McGowan
- Rochelle Okoye - Finhead
- Taylor Hastings - Adelaide
- Laurie Murdoch - CEO
- Jeremy Jordan - Winn Schott
- Jeremy Jordan - Winn Schott / Toyman
- Jeremy Jordan - Winn Schott / Computer Lad / Toyman
- Jennifer Tong - Assistant
- Kelly Ann Woods - Chief of Staff
- Krys Marshall - Julia Freeman / Purity
- Laura Benanti - Alura Zor-El / Astra
- Laura Benanti - Alura Zor-El
- Yuvraj Kalsi - Young Boy
- David Chisum - Ron Collins
- Tim Russ - Jul-Us
- Sofia Vassilieva - Olivia
- Cynthia Stevenson - Mrs. Queller
- Nesta Cooper - Tanya
- Michael Reilly Burke - Preston
- Bradley White - Arthur Willis
- Emma Tremblay - Ruby Arias
- Amy Jackson - Imra Ardeen
- Esmé Bianco - Thara Ak-Var
- Andre Anthony - Edge's Assistant
- Vincent Gale - Dr. Vose
- Cardi Wong - Kesse Kay
- Xander Berkeley - Peter Lockwood
- Iris Quinn - Dean Warren
- Tiya Sircar - Fiona Byrne
- Michelle Krusiec - Natalie Hawkings
- Shannon Chan-Kent - Elizabeth Hawkings
- Adam Levy - Amadei Derros
- Kwesi Ameyaw - Cassian
- Steve Byers - Tom
- Raf Rogers - Earl
- Mathew Yanagiya - Nerdy Computer Programmer
- James Kot - DEO Agent Two
- Carlos Valdes - Cisco Ramon
- Danielle Panabaker - Caitlin Snow / Killer Frost
- Jeremy Davies - John Deegan
- Rick Marcus - Security Guard #1
- Graeme Guthrie - Col. McAllister
- Jonathan Bennett - Quentin
- Lukas Gage - Kevin Huggins
- Erica Durance - Alura Zor-El
- Erica Durance - Noel Neill
- Brennan Mejia - Jerry
- Garwin Sanford - Paul Nal
- Louis Ozawa - Hat
- Jessica Meraz - Pamela Ferrer / Menagerie
- Russell Wong - General Tan
- Tedra Rogers - Bobbi Miller
- Gabriel Gurevich - Mikhail
- Graham Verchere - George Lockwood
- April Parker Jones - Colonel Lauren Haley
- Jennifer Cheon - Midnight
- Kate Micucci - Tour Guide
- Nitin Prasad - Attendant
- Anthony Bolognese - Kid #1
- Zayne Emory - Young Rick Malverne
- Montserrat Powell - Obsidian Engineer
- Kari Wahlgren - Hope (voice)
- Brea St. James - Caroline O'Conner
- Jalen Thomas Brooks - Simon Kirby
- Patricia Isaac - Agent Igle
- Paul Jarrett - Nelson Stewart
- Rahul Kohli - Jack Spheer
- Nick Sagar - Russell Rogers / Rip Roar
- Italia Ricci - Siobhan Smythe
- Italia Ricci - Siobhan Smythe / Silver Banshee
- Lucy Loken - Young Lena Luthor
- Steven Bauer - Bernardo Rojas
- Alexa Najera - Young Andrea Rojas
- Duncan Fraser - Leviathan Messenger
- Grant Gustin - Barry Allen / The Flash
- Caity Lotz - Sara Lance / White Canary
- Ruby Rose - Kate Kane / Batwoman
- Audrey Marie Anderson - Lyla Michaels / Harbinger
- Elizabeth Tulloch - Lois Lane
- Katherine McNamara - Mia Smoak / Blackstar
- Robert Wuhl - Alexander Knox
- Burt Ward - Dick Grayson
- Wil Wheaton - Doomsday Protestor
- Phil LaMarr - Malefic J'onzz
- Griffin Newman - Trivia Night Host
- Dominique Lucky Martell - Alien Girl
- Alan Ritchson - Hank Hall / Hawk (uncredited)
- Russell Tovey - Ray Terrill / The Ray (uncredited)
- Curran Walters - Jason Todd / Robin (uncredited)
- Sarwan Badesha - Onlooker
- Kelten Jensen - Guard One
- Henry Czerny - Winslow Schott / Toyman
- Tristin Mays - Paulina
- Ryan S Williams - Marcus
- Nick Jaine - Another Staffer
- Nick Jaine - Guy #1
- Nick Jaine - Employee #2
- Corbin Bleu - Trevor Crane
- Sean Astin - Pete Andrews
- Jason Mewes - Mississippi Farmer (uncredited)
- Michael Jonsson - Klaus
- Willie Garson - Steve Lomeli
- Nadine Crocker - Scorcher
- Kaylee Sapieha - Darla
- Stephanie Lavigne - Half Extreme Alien
- Stephi Chin-Salvo - Receptionist
- Dawn Chubai - TV Anchor #1
- Dawn Chubai - Newscaster
- Lynda Carter - President Olivia Marsdin (archive footage)
- Kelly Konno - Mother
- Aadila Dosani - Claudia
- Keisha Haines - Human Waitress
- Nilo Ghajar - Inmate #2
- Camille Marty - Young Lena Luthor
- Judith Maxie - Judge Hobart
- Desiree Zurowski - US Attorney Webb
- Rhys Fleming - Daughter
- Jaylee Hamidi - Alana
- Lauren Jackson - Handmaiden
- Erika Walter - Cloaked Woman
- Natasha Burnett - Supreme #1
- Tori Katongo - Supreme #2
- Favour Onwuka - Supreme #3
- Lauren Gibson - Woman
- Dominique Toney - Erika
- Amanda Burke - Dark Kryptonian #2
- Jennifer Koenig - Dark Kryptonian #1
- Mitch Pileggi - Rama Khan
- Meaghan Rath - Querl Dox / Brainiac-5
- Michelle Christa Smith - Sela
- Laura K. MacDonald - Agent #1
- Patrick Rinehart - Agent #2
- Celeste White Steele - Argo Gentlewoman
- Celeste White Steele - Protestor
- Celeste White Steele - Seminar Guest
- Alison Thornton - Young Girl
- Ella Thomas - Tormock
- Anjali Jay - Selena
- Mittita Barber - Vanita
- Janet Glassford - Customer #2
- Vanessa Przada - Erika Morrison
- Carly Nykanen - Editor
- Carly Nykanen - Woman
- Carly Nykanen - Employee #1
- Carly Nykanen - Kelly
- Em Haine - Woman
- Angela Zhou - Dr. Grace Parker / Pestilence
- Brenda Crichlow - Lynn Vang
- Carrie Anne Fleming - Shopkeeper
- Lily Scott - CATCO Employee
- Greta Carew-Johns - Becca
- Carl Lumbly - Myr'nn J'onzz
- Winsome Brown - Dark Kryptonian
- Barbara Patrick - Woman
- Bethany Brown - Instructor
- Cara Buono - Gamemnae / Gemma Cooper
- Jett Klyne - Child
- Lynda Boyd - Eve Tessmacher's Mother
- Neemish Parekh - Hari
- Wonita Joy - Judge
- Stephen Amell - Oliver Queen / Green Arrow
- Stephen Amell - Oliver Queen / Green Arrow / Black Arrow
- Lucy McNulty - Prosecutor
- Roman Podhora - Jury Foreman
- Tricia Collins - Reporter #2
- Sandy Robson - Scar
- Sharon Leal - M'gann M'orzz
- Izabela Vidovic - Young Kara
- Glenn Ennis - Eye-Patched Alien
- Glenn Ennis - Draaga
- Claude Knowlton - Silas
- Winnie Hung - Mrs. Li
- Nicholas Wong - Diner Counter Boy
- Chriss Anglin - Pilot
- Kinna McInroe - Waitress
- Leyna Nguyen - Self
- Paul Stuart - Yale
- Ron Bottitta - Doctor
- Justin Chu Cary - Guard #1
- Preston James Hillier - Fire Chief
- Michael Owen - Thug
- Frank Pacheco - Guard #2
- Rey Valentin - Ricardo
- John Churchill - Second Engineer
- Nerlyn Jean - Waitress
- Angela Meryl - Bus Driver
- Majeed Nami - An Engineer
- Joshua Triplett - Passenger
- Nischelle Turner - Morning Talk Show Host
- Michael Mealor - Fratty Dude
- Tom Waite - Pilot
- Pilar Holland - Female Newscaster
- Hugo Raymundo - Guard #1
- Hugo Raymundo - Guard
- Stephanie Czajkowski - Security Guard
- Iddo Goldberg - Red Tornado / T. O. Morrow
- Renee Pezzotta - Teacher
- Françoise Robertson - Sarah Walker
- Françoise Robertson - Regina Williams
- Joe Bucaro III - Convertible Driver
- Thom Williams - Suburu Driver
- Tyler Hoechlin - Clark Kent / Superman
- Tyler Hoechlin - Earth-38 Superman (archive footage) (uncredited)
- Stephanie Arcila - Woman
- Ashton Bingham - Senior Tech
- Zuhair Haddad - Store Owner
- David Lim - Agent Tsung
- Ayo Sorrells - Agent Reynolds
- Casey Strand - Reporter
- Olivia Nikkanen - Young Alex
- Peter Sudarso - Kenny Li
- Chris William Martin - Naxim Tork
- Nik Andrews - Bartender
- Anita Wittenberg - Glee Club Teacher
- Tom Cavanagh - Harrison 'Nash' Wells / Pariah
- Tom Cavanagh - Dr. Harry Wells / Eobard Thawne / Reverse-Flash
- Louis Aguirre - News Anchor #2
- Fred Henderson - Mayor of Sims
- Fred Henderson - Mayor
- Jennifer Cadena - Assistant
- Gayla Johnson - Board Member #2
- Tiffany Phillips - TV Reporter
- Rey Hernandez - Commander
- Chris Jai Alex - Guard #1
- Jay Jackson - Male Newscaster
- Jay Jackson - News Anchor
- Jay Jackson - News Anchor #1
- Bruno Amato - Security Guard
- Isaac Keys - Guard #3
- Kavita Patil - Doctor
- Hope Lauren - Jane Doe
- Hope Lauren - Bizarro
- Michael Albala - Assistant / Doctor
- Michael Albala - Scientist
- David Salsa - Guard #2
- Scott Alan Smith - Chester Dunholtz
- Jasmine Alveran - Daughter
- John Wesley Shipp - Barry Allen / The Flash (Earth 90)
- John Wesley Shipp - Barry Allen / The Flash (Earth 90) (archive footage)
- Rudy Marquez - Dad
- Jill Morrison - Second Local
- Jill Morrison - Bitsie Teschmacher
- Kent Shocknek - Newscaster
- Christopher Showerman - Tor
- Malina Weissman - Young Kara Zor-El
- Angela Martinez - Newscaster
- Angela Martinez - Field News Reporter
- Kelly Chavers - Girlfriend
- Ruben Vernier - Boyfriend
- Mario Perez - Security Guard #2
- Kitana Turnbull - Costumed Girl
- Vincent Giovanni - Police Officer
- David Hutchison - DEO Agent #1
- Daniel Joseph - DEO Agent #2
- Maisie Klompus - Cat's Assistant
- Tara Macken - Mother
- Anthony N. - Cadmus Passenger
- Mackenzie Brooke Smith - Female Student #1
- Chester E. Tripp III - Cadmus Driver
- Briana Venskus - Agent Susan Vasquez
- Dan Warner - Fire Chief
- Gary Kasper - K'hund
- Cole Michaels - Little Boy
- Jennifer Sommerfeld - Police Officer
- Cheryl Turner - Grandmother
- Tom Belding - Pilot 2
- Cameron Dent - Dad
- Kamaia Fairburn - Young Girl
- Cameron Park - Heli Pilot
- Leif Havdale - Driver at Robbery
- Sachin Sahel - McGill
- Jayson Li - Astronomer
- Shanel Pratap - Newscaster
- Shanel Pratap - TV Anchor #2
- Iris Truong - Young Girl
- Harrison MacDonald - Mummy Bro
- Dan Willows - Werewolf Bro
- Terry Mullett - Buzzcut Merc
- P.J. Prinsloo - Harte
- Michael Ryan - McTavish
- Eddie Flake - Drug Dealer
- Marshall Bingham - Guard #2
- Marshall Bingham - Robber
- Tristan Shire - Terrified DEO Agent
- Jaeson Lee - Police Officer #2
- Jaeson Lee - DEO Agent #1
- Phillip Mitchell - Drug Buyer
- Serge Jaswal - Navigator
- Robin Atkin Downes - Jo (voice)
- David Jacox - Driver
- Nick Marinos - Fists
- Anthony David Moyer - Knife
- Drew Ray Tanner - Student
- Prince Justin Atkinson - DEO Agent
- Noah Beggs - Police Officer #1
- Charles Jarman - Guard #1
- Ben Sullivan - Guard
- Ben Sullivan - Prince of Daxam
- Chad Riley - Prison Guard
- Ian Butcher - Lionel Luthor
- Damian Mavis - Prison Guard
- Walcott E. Morgan - Creepy Guard
- Darren E. Scott - Acolyte
- Darren E. Scott - Baker
- Chad Bellamy - Bystander #3
- Mike Carpenter - Robber #1
- Barry Nerling - Scar
- Byron Noble - Dad
- Dean Redman - Shuster
- Graham Parkhurst - Bastian
- Tom Walsh - Stage Manager
- Jason Diablo - Gang Leader
- Brandon Routh - Superman (Earth-96) (archive footage) (uncredited)
- Brandon Routh - Ray Palmer / The Atom / Clark Kent / Superman
- Shaughnessy Redden - Kryptonian Emissary
- Jason Vaisvila - Boris
- Joel Cottingham - Engineer
- Michael J Rogers - Hannibal
- Andrew McNee - Joe
- Curtis Lum - Demos
- Paul Lazenby - Mandrax
- Paul Lazenby - Lead Fireman
- Paul Lazenby - Goon
- Josh Hallem - Brian
- Sean Kohnke - Creep
- Nickolas Baric - Infernian Attacker
- Nickolas Baric - Acolyte #2
- Nickolas Baric - Stick Up Man
- Nickolas Baric - Rabbit #1
- Pasha Ebrahimi - General
- David Hayter - King Shark (voice)
- Andrea Brooks - Eve Tessmacher
- Andrea Brooks - Eve Tessmacher / Hope
- Jason Bell - Col 1
- Jason Bell - Cadmus Guard
- Dexter Bell - Buyer
- Joe Costa - Customer #1
- Jason Burkart - Customer #3
- Berlin Lu - Valet
- Conor Stinson O'Gorman - Man
- Ryan McNeill Bolton - Cop
- Bryan Demore - Security Guard
- Shayn Walker - Police Officer
- Corey Schmitt - Suspect
- Mark Dozlaw - Assistant
- Benjamin Goas - Val
- Ivan Wanis-Ruiz - DEO Agent
- Kerry Sandomirsky - Felra
- Todd Thomson - Lir-Al
- Timothy Wallace - Cop
- Alison Araya - District Attorney Diaz
- Javier Lacroix - Curator
- Latonya Williams - Mom
- Fulvio Cecere - Massimo
- Ese Atawo - Counter Protestor
- David Patrick Green - Angry Protestor
- Dustin Brooks - Stunt Prisoner #1
- Dustin Brooks - Rent-A-Cop
- Shaquan Lewis - Alien Protester
- Lissa Neptuno - Mr. Average Joe
- Lisa Chandler - Soccer Mom
- Lisa Chandler - Bystander #2
- Byron Brisco - Guard #2
- Byron Brisco - Security Guard
- Christopher Webb - Alien
- Anthony Konechny - Raymond Jensen
- Patti Allan - Margot
- Patti Allan - Leviathan Agent
- Patti Allan - Woman
- Abby Ross - Alien Student
- Kareem Malcolm - Another Student
- Jaren Moore - Thack
- David Quinlan - Quill
- Gary Starkell - Gary Forehead
- Julia Tortolano - Friend
- Justice Leak - Hellgrammite
- Nick Hunnings - Kopy
- Flora Karas - Receptionist
- Robyn Daye Edwards - Middle-Aged Woman
- Trevor Hinton - Infernian
- Tony Ofori - Miles
- Kyle Strauts - Valeronian
- Chris Violette - Domingo
- Kaylah Zander - Mother
- Andrea Drepaul - Sean Chui
- Jason Griffith - Mask 1
- Lisa MacFadden - Gal
- Kirby Morrow - Officer Petrocelli
- Philip Prajoux - Guy
- Cliff Prang - Alien Father
- Khamisa Wilsher - Assistant
- Sam Yunussov - Col 4
- Keith Silverstein - Child of Liberty (voice)
- Michael Johnston - Adam / Subject 0331
- Rebekah Asselstine - Assistant
- Jason Cermak - Caldwell
- Artin John - Col
- Eric Regimbald - Col
- Sarah Smyth - Lydia Lockwood
- Timothy Lyle - Frank
- Timothy Lyle - Fake Agent Liberty / Frank
- Sonia Sunger - News Anchor
- Sonia Sunger - Newscaster
- Sonia Sunger - Reporter
- Sean Kuling - DEO Agent One
- Sean Kuling - DEO Guard
- Cassandra Jean Amell - Nora Fries
- Adam Tsekhman - Bartender
- Claudia Kai - Young Woman
- Jojo Ahenkorah - DEO Agent #1
- Sasha Piltsin - Soldier
- Sasha Piltsin - Kasnian Soldier
- Sasha Piltsin - Kaznian Soldier
- Hamza Fouad - Agent Lawrence
- Brian Cyburt - Spencer
- Madison Smith - Josh
- Melice Bell - Ashley
- Zack Currie - Chuck Grossman
- Brian Doe - Doug
- Flossie McKnight - Guard
- Elinet Louicius - Guard
- Sheldon Trosko - Marine Guard #5
- Paul Almeida - Cracked Mask Child of Liberty
- Fraser Aitcheson - Lead Guard
- Fraser Aitcheson - Col 5
- Stephanie Cho - Alien Mother
- Kate Burton - Isabel Nal
- Kate Burton - Isabel Nal (voice)
- Madeleine Kelders - Reporter #1
- Shawn Stewart - Muscular Alien
- William MacDonald - Dr. Kaplan
- Christina Lewall - Trauma Doctor
- Amos Stern - Guard #3
- Candus Churchill - Judge
- Rady Panov - Class Clown
- Adam Ballantyne - Second Looter
- Adam Ballantyne - Child of Liberty #1
- Alex Vishniakoff - Minister of Defense
- V.G. Winter - Ansley Crew
- Raphael Kepinski - Kaznian General
- Raphael Kepinski - Kasnian General
- Tamiko Brownlee - Bailiff
- Karin Konoval - Senator Granberry
- Sunny Chen - Passerby
- Parveen Dosanjh - Dr. Park
- Reese Alexander - Warden
- William Belleau - Angry Inmate
- Michael Brian - Dan
- Norah Debra Dobbyn - Young Lena
- Donald Sales - Platoon Captain
- Jesse Stretch - Bold Inmate
- Emily Tennant - Edna
- Darcy Hinds - Control Room Guard
- Darcy Hinds - Dealer
- Darcy Hinds - Dynamorph
- James Michalopolous - Igor Starros
- James Michalopolous - Goon 1
- Solomon Irama - Bully #2
- Tawny West - Reporter
- Tawny West - News Anchor
- Marlon Kazadi - Young James
- Ava Kelders - Girl Alien
- Alex Stines - First Looter
- Julie Webster - Woman
- Toni Nielsen - DEO Agent #3
- Toni Nielsen - News Anchor #2
- Michael Adamthwaite - Cooper
- Christine Bortolin - Alien Woman
- Mark Krysko - Head Guard
- Al McFoster - Secret Service Agent
- Colby Wilson - Guard 2
- Ryan Hesp - Agent Sloan
- Ryan Hesp - DEO Agent
- Kapila Rego - Lena's Assistant
- Julia Harnett - Saleswoman
- Cassandra Cavalli - Counter Lady
- Ava Frica - Martian Child #4
- Marcello Guedes - Young Malefic
- Eric Gustafsson - Receptionist
- Babak Haleky - Janitor
- Balinder Johal - Old Lady
- Marc-Anthony Massiah - Dr. Andrew Stern
- Sasha Rojen - Martian Child #1
- Luisa d'Oliveira - Elena Torres / Breathtaker
- Jerry Bannister - Construction Worker
- Mark Sussman - Kelex / Oscar (voice)
- Mark Sussman - Kelex (voice)
- Larry MacDonald - Strange Man
- Chris Nowland - Grocer
- Arran Henn - Newscaster
- Arran Henn - News Reporter
- Arran Henn - News Anchor
- Arran Henn - TV Talking Head
- Arran Henn - News Anchor #2
- Arran Henn - Reporter
- Arran Henn - Reporter (On Monitor)
- Michel Issa Rubio - Doorman
- Paralee Cook - Waterfront Citizen #1
- Joshua Mazerolle - Army Guard
- Shawn Ahmed - Aide
- Jan Bos - Governor Tom Harper
- Miguel Castillo - Guide
- Lynn Colliar - Newscaster
- Amanda Gray - DEO Agent #2
- Donna Benedicto - DEO Agent
- Donna Benedicto - Agent Reiff
- Ryan Mah - Officer
- Jay Clift - Lead FBI Agent
- Lia Lam - DEO Agent
- Chad Lowe - Thomas Coville
- Andy Rukes - Lillian's Attorney
- Camille Sullivan - Amy
- Jason Beaudoin - Dmitri
- Scott McNeil - Toby
- Edwin Perez - Harry
- Mélania Solano - Natalia Guzman
- Millan Tesfazgi - Scared Employee
- Andrew Wheeler - Warden
- Brent Zulyniak - Todd Sapphire
- Roxy Wood - Yvette
- Pierson Fodà - Angus / Gregory Bauer
- Betty Buckley - Patricia Arias
- Betty Buckley - Owl (voice)
- Jesse Moss - Richard Bates
- Anna Van Hooft - Jennifer Bates
- Doron Bell - Detective Rivers
- Tarun Keram - Henry / Man in Tank
- Teresa Laverty - Choking Man's Wife
- Rico Simonini - Frank
- Owen Walstrom - Choking Man
- Pietra Castro - Kid #1
- Steph Song - VR Supergirl
- Marc Gaudet - NPC-Mac
- Peter Hall - NPC-Abe Lincoln
- Malcolm Masters - Dr. Niles Jarrod
- Anne Hollister - Tilly / Bonnie
- John Murphy - Derek
- Ryan Mutama - Cop
- Demord Dann - Prison Guard
- Jason Behr - Zor-El
- Everett Andres - Young Boy
- Guy Christie - Passerby
- Neetu Garcha - NPC-Reporter
- Neetu Garcha - Anchor #2
- David Ramsey - John Diggle
- Eliza Helm - CJ Grant
- Aiden Stoxx - Joey Davis
- Tom Jackson - Warden Wyatt Kote
- Susan Hogan - Ms. Hochschild
- John Gillich - Officer Chapman
- Nadia Batista - Marta
- Thomas Lennon - Mxyzptlk
- Masa Delara - Impatient Woman
- Tom Lim - Dr. Desmond Raab
- Ava Marchfelder - Young Maeve
- Emmanuelle Vaugier - Margaret 'Peggy' Bishop
- Larry Hoe - David
- Bronwen Smith - Dee-Dee
- Kari Matchett - Councilwoman Jean Rankin
- Colleen Wheeler - Florence Abbott
- Moire Kiyingi - Nurse
- Bianca Lawrence - Young Girl
- Simon Webb - Philippe
- Simon Webb - Butler
- J.P. Padda - Gordon
- Iris Paluly - Reporter
- Jonathan Wilde - EMT #1
- Theresa Wong - ER Doctor
- Hannah James - Maeve Nal
- Rosemary Hochschild - Vita
- Adrian Hough - King Brpxz
- Holly Deveaux - Dr. Beatrice Lahr
- Spencer Borgeson - Bryxly
- Jessie Liang - Dorothy
- Keith Dallas - Al
- Keith Dallas - Al / Al #2
- Ronald Patrick Thompson - Dr. Frank Gale
- Jay Hindle - Joe Ford
- Adrian Persad - Frank Creed
- Alana Hawley Purvis - Dana Ford
- Remy Marthaller - Little Girl
- Don Mike - Don
- Dave Santana - Prime Minister Perez
- Dave Santana - Corto Maltesian Prime Minister
- Tosca Baggoo - Governor Peña
- Brandy Le - Production Assistant
- Helen Slater - Eliza Danvers
- Jon Cryer - Lex Luthor
- Robert Baker - Otis Graves
- Ecstasia Sanders - Dana
- Jaymee Mak - MacKenzie
- Andrew Morgado - Totem Oracle (voice)
- Brenda Strong - Lillian Luthor
- Matt Baram - Mitch
- Jhaleil Swaby - Orlando Davis
- Mila Jones - Esme
- Crystal Balint - Secretary Brown
- Josh Chambers - First Local
- Jen Troy
- Jerry Siegel
- Joe Shuster
- Jess Kardos
- Nicki Holcomb
- Chris Pavoni
- David Rapaport
- Saray D. Guidetti
- Jennifer Carpenter Hernandez
- Karen Maser
- Lyndsey Baldasare
- Blake Neely
- Daniel James Chan
- Season Kent
- Gabe Hilfer
- Angela Claverie
Willie Garson hace el papel de Steve Lomeli.
Harriet Sansom Harris hace el papel de Sinead.
Thomas Lennon interpreta a Mxyzptlk en la serie.
Jeremy Davies interpreta a John Deegan en la serie.
Sean Astin hace el papel de Pete Andrews.
Emmanuelle Vaugier hace el papel de Margaret 'Peggy' Bishop.
Steven Bauer interpreta a Bernardo Rojas en la serie.
Xander Berkeley interpreta a Peter Lockwood en la serie.
Robert Wuhl interpreta a Alexander Knox en la serie.
Sara Gilbert hace el papel de Sara Gilbert.
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