He is perhaps best known for his recurring role as Simon O'Neill, Cylon model number four, in the reimagined Battlestar Galactica.

[1] Worthy became a stage actor in Detroit, then moving to Chicago to develop his theatrical skills.

[4] He guest-starred in "The Warrior", a 2001 episode of Stargate SG-1, where he made use of his Tai Kung Do and stunt fighting skills as the Goa'uld Imhotep.

He appeared on the 2003–09 re-imagined version of Battlestar Galactica as Cylon model number Four, often referred to as "Simon".

Worthy appeared in four episodes of Heroes in 2009, playing "Mike", Matt Parkman's partner, an experienced and capable Los Angeles cop.