#3 Donald Cerrone - It's Always Sunny in Philadelphia
Donald Cerrone was a guest star in the long-running comedy series It's Always Sunny in Philadelphia. Cerrone appeared in the season 12 episode "Wolf Cola: A Public Relations Nightmare" in an episode that also featured a cameo from Dana White.
#2 Chuck Liddell - Bones, Criminal Minds etc
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Chuck Liddell has actually appeared in a number of moves and tv shows. The best known among his television cameos are his appearances in Bones and Criminal Minds.
Liddell appeared in a 2013 episode of Bones called 'The Lady on the List'. Liddell plays himself on the episode and got involved after a video surfaced of the victim walking up to Liddell and punching him in the face before turning up dead.
Liddell also appeared in Criminal Minds: Suspect Behaviour in 2011.