- Jade Harrison - Bayla
- Chris Jarman - Jarko Dornick
- Joyce Grey-Carter - Synnaxian Stone Remover
- Nikhil Dubey - Bomber #1
- Proschat Madani - Lors Avakim
- Kirsten Block - Chamberlain
- Samir Fuchs - Prime Magistrate
- Jerry Kwarteng - Imperial Guardian Suit
- Barry McGovern - Orlio
- Alexander Siddig - Advocate Xylas
- Chipo Chung - Lowre
- Reece Shearsmith - Jerril
- Carolina Main - Ambassador Shae Un Shae
- Antony Bunsee - Ambassador Xandem
- Brian Bovell - Trantorian Seer Priest
- Cooper Carter - Young Brother Dawn
- Florence Ordesh - Briwan
- Ahd Tamimi - Magnus
- Georg Nikoloff - Senior Laundry Worker
- Abdul Alshareef - Comms Tech
- Daniel MacPherson - Hugo Crast
- Kim Adis - Lowre
- Johanna O'Brien - Shivaughn
- Vanessa Ifediora - Imperial Herald
- Christian Contreras - Dorwin
- Martin McDougall - Akiva
- Ryan Ali - The Beggar Computer (voice)
- Alfred Enoch - Raych Foss
- Jayne Giordanella - Mother Zephyr
- Sarah Naudi - Maiden Zephyr
- Nikol Kollars - Jacenta
- Geoffrey Cantor - Ambassador Thanwall
- Elliot Cowan - Lewis Pirenne
- Clarke Peters - Abbas
- Shauna Black - The Raven Computer (voice)
- Darragh O’Toole - Romus
- Buddy Skelton - Keir
- Muiris Crowley - Captain Tacud
- Muiris Crowley - Tacud
- Chloe Lea - Gia
- Mido Hamada - Shadow Master Obrecht
- Sasha Behar - Mari
- Pravessh Rana - Rowan
- Amy Tyger - Azura
- Nikhil Parmar - Freestone
- Stuart McQuarrie - Lunden
- Kubbra Sait - Phara
- Julia Farino - Zephyr Gilat
- T'Nia Miller - Zephyr Halima
- Joseph Palmer - Imperial Servant
- Rory Nolan - Muller Holk
- Nimrat Kaur - Dr. Yanna Kine
- Holt McCallany - Warden Jaegger Fount
- Ella-Rae Smith - Queen Sareth I of Cloud Dominion
- Sandra Yi Sencindiver - Enjoiner Rue Corintha
- Oliver Chris - Director Sef Sermak
- Rowena King - Kalle
- Elsie Bennett - Kariel Seldon
- Sean Rigby - Nolan Seldon
- Eva Bradley-Williams - Varia
- Jairaj Varsani - Poly
- Jairaj Varsani - Young Poly Verisof
- Emily Stott - Oreen
- Wade Briggs - Brigadier Manlio
- Anthony Barclay - Councilor Sutt
- Haqi Ali - Handman Hahn
- Jim High - Shadowmaster Greeve
- James Beaumont - Lead Imperial Surgeon
- Abigail Rice - Imperial Doctor #1
- Roy McCrerey - Imperial Doctor #2
- Isabella Laughland - Novice Claric Brother Constant
- Kulvinder Ghir - High Claric Brother Poly Verisof
- Mikael Persbrandt - The Mule
- Luis Torrecilla - Pater
- Noah Taylor - Hetman
- Jordan Stephens - Jori
- Jesper Christensen - Ducem Barr
- Ben Daniels - Bel Riose
- Dimitri Leonidas - Hober Mallow
- Dino Fetscher - Glawen Curr
- Judi Shekoni - She-Bends-Light
- Philip Glenister - Commdor Argo
- May Simón Lifschitz - Forcer Wallick
- Ian Benson - Executioner
- Afolabi Alli - Claviger Markley
- Susan Aderin - Vrank
- Ephraim Goldin - Air Officer Kress
- Rachel House - Tellem Bond
- Michael Akinsulire - Loron
- Amelia Minto - Tellem Bond - Age 10
- Kit Rakusen - Josiah
- Callina Liang - Young Rue Corintha
- Ed Birch - Keeper Yartell
- Sandra Guldberg Kampp - Thalis
- Evelyn Miller - She-Shines-Brightly
- Isabel Adomakoh-Young - Timandra
- Petra van de Voort - Councilor Twer
- Fiona O'Shaughnessy - Dr. Tadj
- Michael S. Siegel - Councilor Garrow
- Winslow Iwaki - Running Man
- Martina Babišová - Woman with Noose
- Eric Goode - Bridge Jump Man
- Mahmoud Aldachan - Ferzan
- Brian Caspe - Dr. Oran
- Sam Barlien - Worker #3
- Orla O'Rourke - Empress Winnoset 2
- Brendan Sheehan - Emperor Stanel the 6th
- Sinéad Phelps - Pellis 3 Pilot
- David Bowles - Pellis 6 Pilot
- Rachel Lascar - Brother Ardent
- Doireann May White - Ensign
Noah Taylor interpreta a Hetman en la serie.
Alexander Siddig hace el papel de Advocate Xylas.
Jesper Christensen hace el papel de Ducem Barr.
Stuart McQuarrie hace el papel de Lunden.
Jared Harris hace el papel de Hari Seldon.
Lee Pace hace el papel de Brother Day.
Lou Llobell interpreta a Gaal Dornick en la serie.
Leah Harvey interpreta a Salvor Hardin en la serie.
Laura Birn hace el papel de Demerzel.
Cassian Bilton interpreta a Brother Dawn en la serie.
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