Common Side Effects Season 1 Characters & Cast — No Spoilers
Every character in Common Side Effects season 1 with photos and the actors who play them, including Dave King, Emily Pendergast, Mike Judge — spoiler-free, nothing from later seasons.
- Marshall Cuso (voice) — played by Dave King
- Frances Applewhite (voice) — played by Emily Pendergast
- Rick Kruger (voice) — played by Mike Judge
- Agent Harrington (voice) — played by Martha Kelly
- Agent Copano (voice) — played by Joseph Lee Anderson
- Hildy (voice) — played by Sue Rose
- Diane (voice) / Amelia (voice) / Linda Tree (voice) — played by Shannon Woodward
- Bud Budrigger (voice) / Nick (voice) / Frat Guy (voice) — played by Ben Feldman
- Cecily (voice) — played by Sydney Tamiia Poitier
- Kelly (voice) / Female DEA Agent (voice) / Oncologist (voice) / Susan (voice) — played by Shalita Grant
- Jonas Backstein (voice) — played by Danny Huston
- Rusty (voice) — played by Steve Hely
- Kiki (voice) — played by Christine Ko
- Zane (voice) — played by Alan Resnick
- Sonia (voice) — played by Lin Shaye
- Connor (voice) / Samurai (voice) / Line Guy 2 (voice) — played by Bob Stephenson
- DEA Dispatcher (voice) / Lawyer (voice) / Test Subject 3 (voice) — played by Timothy Simons
- Hoang (voice) — played by Jon Foor
- Christopher (voice) / Mysterious Passenger (voice) — played by Andy Daly
- Tommy (voice) — played by Nicolas Cantu
All seasons of Common Side Effects: full spoiler-free character guide