Actors in both Smallville and The 100
79 actors have appeared in both Smallville and The 100, across 317 episodes. The most-credited is Alessandro Juliani, Dr. Emil Hamilton in Smallville and Jacapo Sinclair in The 100.
| Actor | In Smallville | In The 100 | Eps | Eps |
|---|---|---|---|---|
| Alessandro Juliani | Dr. Emil Hamilton | Jacapo Sinclair | 14 | 20 |
| Sarah Jane Redmond | Nell Potter | Kaylee Lee | 11 | 5 |
| Mike Dopud | Security Guard George | Michael Vinson | 10 | 5 |
| Alaina Huffman | Dinah Lance / Black Canary | Nikki | 6 | 8 |
| Erica Cerra | Adrianna Tomaz, Lex's Aid, Sorority Girl | Alie, Becca Franko | 3 | 21 |
| John Pyper-Ferguson | Dr. William McBride | Bill Cadogan | 1 | 10 |
| Sharon Taylor | Faora | Council Member #2 | 7 | 4 |
| Hiro Kanagawa | Principal H. James Kwan | Council Member #3 | 5 | 4 |
| Rekha Sharma | Dr. Harden | Lorelei Tsing | 7 | 9 |
| Chris Shields | Courier, EMT #1, Reporter | David Miller | 4 | 11 |
| Colin Lawrence | Agent Stocker, Captain Nichols, Doctor | Rivo | 3 | 2 |
| Ian Tracey | Lincoln Cole | Vincent Vie | 1 | 3 |
| JR Bourne | Dr. Bernard Chisholm | Russell Lightbourne VII | 1 | 10 |
| Ty Olsson | Officer Talbert | Nyko | 1 | 10 |
| Gwynyth Walsh | Mrs. Moore | Josephine Lightbourne VII | 1 | 2 |
| Kendall Cross | Jessica Kent, Lara-El, Little Girl's Mother | Major Byrne | 3 | 8 |
| John DeSantis | Male Zoner, Solomon Grundy, The Traveler | Gideon | 3 | 2 |
| Britt Irvin | Courtney Whitmore / Stargirl | Alyssa | 4 | 3 |
| Aleks Paunovic | Orderly, Thug #1 | Gustus | 2 | 4 |
| Monique Ganderton | Alia | Aurora Blake | 4 | 2 |
Cast data from TVmaze, licensed CC BY-SA 4.0.