- Tina Casciani - Tierney
- Banita Sandhu - Delaney Pilar
- John Harlan Kim - Greg Li
- Martin Bobb-Semple - Thomas James Ross
- Manu Bennett - Leone Vokk
- Tehmina Sunny - Regan Fried
- Tommie Earl Jenkins - Professor Ellison Pevney
- Akshay Kumar - Jett Annamali
- J.R. Esposito - The Courier
- Luke Fetherston - Harlan Fried Jr.
- Luke Fetherston - Younger Harlan Fried
- Karina Banno - Atria Three
- Dino Kelly - Lt. Cade Collins
- Charlotte Salt - Norris
- Mercer Boffey - Bennings
- Sophie Robertson - Magda Coy
- Richard Blackwood - Billy Dwayne Ross
- Douglas Reith - Prescott Fleming
- Alexander Hanson - Nelson Fisk
- Maryam d'Abo - Maya Fleming
- Nathan Cooper - Academy Librarian
- Lola Ogunyemi - Kossara
- Daniel Feuerriegel - Devlin
- Erin Gray - Captain Beth Grant
- Marc Crumpton - Marcus Taylor
- Ben Cross - Harlan Fried
- Jeffrey Combs - Berman Livingston
- Andi Osho - Rosa Ross
- Angélica Celaya - Pandora
- Carla Woodcock - Sarika Larson
- Phill Langhorne - Elias Wilson
- Johann Urb - Captain Jaworski
- Amy McPherson - Matta Ral
- Isabelle Bonfrer - Cordelia Fried
- Charisma Carpenter - Eve
- Jonathan Kerrigan - Seeker Creston Hubbell
- Ana Alexander - Phobus
Priscilla Quintana interpreta a Jacqueline "Jax" Zhou en la serie.
Noah Huntley interpreta a Professor Donovan Osborn en la serie.
Ben Radcliffe interpreta a Ralen Maht en la serie.
Vikash Bhai interpreta a Professor Martin Shral en la serie.
Oliver Dench interpreta a Xander Duvall en la serie.
Tina Casciani interpreta a Tierney en la serie.
Luke Fetherston interpreta a Harlan Fried Jr. en la serie.
Akshay Kumar interpreta a Jett Annamali en la serie.
J.R. Esposito interpreta a The Courier en la serie.
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