Michael O'Hearn has appeared in the movies Barbarian , Keeper of Time , and had a minor supporting role in Death Becomes Her , as well as starred as Clark Kent / Superman in the popular Sandy Collora fan film World's Finest (opposite Clark Bartram as Batman ).  O'Hearn was also on the American Gladiators -like show Battle Dome from 1999 to 2001 where he played Michael O'Dell. On March 14, 2008, Michael made a guest appearance on the NBC soap opera Days of Our Lives , playing a bartender. On July 8, 2008, Michael made a guest appearance on NBC's Celebrity Family Feud as Titan with fellow Gladiators Wolf, Venom, and Jet.  On February 4, 2009 Michael made a guest appearance on NBC's Knight Rider , episode 14 as a cage fighter,  and in 2011 he appeared in a season 7 episode of It's Always Sunny In Philadelphia titled "How Mac got fat" as Mac's Avatar. In June 2011, Mike also played the part of "the bodybuilder" in season 1 episode 9 of Workaholics, "Muscle I'd Like To Flex".