| Name | Character | Episodes |
|---|---|---|
| Stephan James | Halan Kai Nielsen | 16 |
| Lena Headey | Aster Calyx | 11 |
| Eric Lange | Milan Aleph | 6 |
| Bo Martynowska | Lilya Gashade | 5 |
| Stephen Root | Solomon Smythe | 4 |
| Marc Menchaca | Keir | 4 |
| Noah Lamanna | Dev | 4 |
| Matilda Legault | Parsim | 4 |
| Sydney Ozerov-Meyer | Grisha | 3 |
| Zarrin Darnell-Martin | Nybecca | 3 |
| Tenika Davis | Xalterrica | 3 |
| Jess Salgueiro | Saldana | 3 |
| Daniel Malik | Finch | 3 |
| David Tompa | Dosto Bix Chennault | 3 |
| Ish Morris | Yeiki | 3 |
| Sandrine Holt | Coley | 2 |
| Barbara Hershey | Sophie | 2 |
| Jeananne Goossen | K-Cin | 2 |
| Dylan Taylor | Giciru | 2 |
| Carolina Bartczak | Dr. Ree Avalon | 2 |
| Ben Cain | Kadir Soon Nielsen | 2 |
| Eric Lange | Milan Aleph (voice) | 1 |
| Paulino Nunes | Timur 'Battle' Ondi | 1 |
| John Kapelos | Jocko | 1 |
| Tara Rosling | Randall | 1 |
| Joshua Peace | Val Endu | 1 |
| Milton Barnes | Cerran | 1 |
| Marnie McPhail | Dr. Rojan Kaneddy | 1 |
| Jaeden Noel | Chick | 1 |