Distrust in Alder grows as Tally and Abigail pressure those in power for changes. Raelle gains a deeper understanding of the Mycelium and its purpose for her.
| Name | Type | Role | |
|---|---|---|---|
| Bryan Q. Miller | Writer | ||
| Diana Pavlovská | Guest Star | Willa Collar | |
| Karen Khunkhun | Guest Star | Reporter (Boston TV) | |
| Ava Marchfelder | Guest Star | Tiffany | |
| Sheryl Lee Ralph | Guest Star | President Kelly Wade | |
| Emilie Leclerc Côté | Guest Star | Izadora | |
| Rachel Park | Guest Star | Incoming Cadet | |
| Lynn Whyte | Guest Star | Biddy | |
| Bob Frazer | Guest Star | Alban Hearst | |
| Althea Kaye | Guest Star | Biddy | |
| Praneet Akilla | Guest Star | Gregorio | |
| Kylee Brown | Guest Star | Khalida | |
| Sarah McInnes | Guest Star | Sekhmet #1 | |
| Diane Adams | Guest Star | Biddy | |
| Ess Hödlmoser | Guest Star | M | |
| Tony Giroux | Guest Star | Adil | |
| Nesta Chapman | Guest Star | Interrogation Witch | |
| Sandra Ferens | Guest Star | Quinn | |
| Victor Webster | Guest Star | Blanton Silver | |
| Mozhdah Jamalzahad | Guest Star | Upset Cadet | |
| Soheila Vatandoost | Guest Star | Biddy | |
| Luc Roderique | Guest Star | Sterling Woodlot | |
| Catherine Lough Haggquist | Guest Star | Petra Bellweather | |
| Jennifer Tong | Guest Star | Shireen | |
| Lillian Lim | Guest Star | Biddy | |
| Mellany Barros | Guest Star | Penelope Silver | |
| La Nein Harrison | Guest Star | Biddy | |
| Hrothgar Mathews | Guest Star | Edwin Collar | |
| Arlen Aguayo | Guest Star | Nicte Batan | |
| Valentina Andrade | Guest Star | Crying Cadet | |
| Dale Hunter | Guest Star | Biddy | |
| David Frazee | Director |