Filmography
| Year | Title | Role | Notes |
|---|---|---|---|
| 2001 | ER | Tommy | Episode: "Fear of Commitment" |
| 2001–03 | JAG | Beasley | 3 episodes |
| 2001 | Arliss | Mourner | Episode: "Of Cabbages and Kings" |
| 2001 | Murder in Small Town X | First Mate Moe Zaleski | 1 episode |
| 2002 | Dark Angel | Marrow | Episode: "Love in Vein" |
| 2002 | She Spies | Jason | Episode: "Daddy's Girl" |
| 2003 | Angel | John Stoler | Episode: "Shiny Happy People" |
| 2003 | Lyon's Den, TheThe Lyon's Den | Bryce Cherot/Chucke Porter | Episode: "Duty to Serve" |
| 2003 | Star Trek: Enterprise | Sloth#3 | Episode: "The Shipment" |
| 2004 | Cold Case | James Creighton | Episode: "The Plan" |
| 2004 | NCIS | Staff Sgt. Rafael | Episode: "Split Decision" |
| 2004 | Star Trek: New Voyages | Guardian's Voice | Episode: "In Harm's Way" |
| 2004–05 | Battlestar Galactica | Lt. Crashdown | 11 episodes |
| 2006 | Crank | Shootout Henchmen | |
| 2006 | Dexter | Neil Perry | 3 episodes |
| 2006 | Bones | Mitchell Downs | 1 episode |
| 2007 | Mist, TheThe Mist | Private Jessup | |
| 2007 | It's Always Sunny in Philadelphia | Muscular Man | Episode: "Dennis and Dee's Mom Is Dead" |
| 2007 | Shark | Richard Lee Franco | Episode: "Every Breath You Take" |
| 2007–08 | CSI: Crime Scene Investigation | Officer Casella | Episodes: "Go to Hell", "The Theory of Everything" and "Drops Out" |
| 2008–09 | Smallville | Davis Bloome / Doomsday | As Davis Bloome/Doomsday – 22 episodes As Major Zod – 1 appearance uncredited |
| 2009 | Gamer | Social Worker | |
| 2010 | No God, No Master | Eugenio Ravarini | |
| 2010 | The Walking Dead | Zombie soldier inside the tank | Episode: "Days Gone Bye" |
| 2010 | Return of Joe Rich, TheThe Return of Joe Rich | Joe Neiderman | |
| 2011–present | Being Human | Aidan Waite | Main Role; Nominated – Gemini Awards (2011 – Best Performance by an Actor in a Continuing Leading Dramatic Role) |
| 2012 | Lego Star Wars: The Empire Strikes Out | Darth Maul | |
| 2012–2013 | Star Wars: The Clone Wars | Son / Darth Maul |
Read more about this topic: Samuel Witwer