Other Characters
The following is a supplementary list of recurring guest stars, which includes characters that appear briefly in multiple episodes, like a regularly appearing doctor, but have little to no real world content to justify an entire section covering their in-universe histories. The characters are listed in the order in which they first appeared on Smallville.
- Season 1
- Sarah-Jane Redmond as Nell Potter
- Jason Connery as Dominic Santori
- Tom O'Brien as Roger Nixon
- Hiro Kanagawa as Principal Kwan
- Robert Wisden as Gabe Sullivan
- Joe Morton as Dr. Steven Hamilton
- Kelly Brook as Victoria Hardwick
- Rekha Sharma as Dr. Harden
- Julian Christopher as Dr. MacIntyre
- Season 2
- Jerry Wasserman as Dr. Yaeger
- Patrick Cassidy as Henry Small
- Martin Cummins as Dr. Garner
- Jill Teed as Maggie Sawyer
- Rob LaBelle as Dr. Walden
- Season 3
- Françoise Yip as Dr. Tang
- Lorena Gale as Dr. Claire Foster
- Sarah Carter as Alicia Baker
- Alisen Down as Lillian Luthor
- Gary Hudson as Frank Loder
- Season 4
- Kyle Gallner as Bart Allen/Impulse
- Jane Seymour as Genevieve Teague
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- Season 5
- Alan Ritchson as Arthur Curry/Aquaman
- Lee Thompson Young as Victor Stone/Cyborg
- Season 6
- Fred Henderson as Dr. Langston
- Ben Ayres as Bartlett
- Phil Morris as John Jones
- Season 7
- Kim Coates as Federal Agent Carter
- Don Broatch as Shaw Madson
- Alaina Huffman as Dinah Lance/Black Canary
- Season 8
- Anna Williams as Eva
- Alessandro Juliani as Dr. Emil Hamilton
- Serinda Swan as Zatanna Zatara
- Season 9
- Adrian Holmes as Basqat
- Sharon Taylor as Faora
- Monique Ganderton as Alia
- Ryan McDonell as Stuart Campbell
- Pam Grier as Agent Amanda Waller
- Crystal Lowe as Vala
- Michael Shanks as Hawkman/Carter Hall
- Britt Irvin as Courtney Whitmore/Stargirl
- Season 10
- Ted Whittall as Rick Flag
- Keri Lynn Pratt as Cat Grant
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