| Name | Character | Episodes |
|---|---|---|
| Anthony Stewart Head | Himself - Narrator | 31 |
| Santiago Cabrera | Himself - Narrator | 13 |
| Ali Larter | Herself | 1 |
| Milo Ventimiglia | Himself | 1 |
| Jack Coleman | Himself | 1 |
| Adrian Pasdar | Himself | 1 |
| Santiago Cabrera | Himself | 1 |
| Masi Oka | Himself | 1 |
| Sendhil Ramamurthy | Himself | 1 |
| Greg Grunberg | Himself | 1 |
| James Kyson | Himself | 1 |