Actors in both Once Upon a Time and The 100
69 actors have appeared in both Once Upon a Time and The 100, across 256 episodes. The most-credited is Jarod Joseph, Billy, Gus in Once Upon a Time and Nathan Miller in The 100.
| Actor | In Once Upon a Time | In The 100 | Eps | Eps |
|---|---|---|---|---|
| Jarod Joseph | Billy, Gus | Nathan Miller | 8 | 66 |
| Sean Maguire | Robin Hood | Russell Lightbourne | 33 | 3 |
| John Pyper-Ferguson | Kurt Flynn | Bill Cadogan | 1 | 10 |
| Olivia Steele-Falconer | Violet | Young Octavia | 8 | 1 |
| Chris Shields | Military Advisor | David Miller | 1 | 11 |
| Lee Majdoub | Sir Kay | Nelson / Sachin | 1 | 10 |
| Ty Olsson | Hordor | Nyko | 1 | 10 |
| Kendall Cross | Katie | Major Byrne | 1 | 8 |
| Jonathan Whitesell | Hercules | Bryan | 1 | 10 |
| Toby Levins | Sergeant | Carl Emerson | 1 | 10 |
| Paul Lazenby | Claude, Black Knight No. 1, Mirror-Carrying Knight | Rockline Warrior, Sidekick | 4 | 4 |
| Adam Lolacher | Black Knight #2 | Jeremiah | 1 | 8 |
| Karen Holness | Witch of the North | Blythe Ann Workman | 1 | 10 |
| Max Montesi | Peasant Boy | Lindo the Defector | 1 | 6 |
| Nick Hunnings | Peasant, Prison Guard | Lee | 2 | 4 |
| Aleks Paunovic | Berkley | Gustus | 1 | 4 |
| Chad Rook | Captain Ahab | Hatch | 1 | 3 |
| Manny Jacinto | Quon | Boy #1, Boy Bullied by Murphy | 1 | 2 |
| Sharon Taylor | Witch of the East | Council Member #2 | 1 | 4 |
| Greyston Holt | Jim/Frederick | Gavin / Marcus Kane II | 2 | 2 |
Cast data from TVmaze, licensed CC BY-SA 4.0.