Community: 10 Best Guest Stars

10. Joe Lo Truglio

Joe Lo Truglio is a comedian who has made his mark in comedy for over 2 decades. It's not hard to understand why. He is an incredibly funny and talented comedian who brings an incredible energy to every role he takes on.

In recent years, this main role has been Charles Boyle in the former Fox turned NBC smash comedy Brooklyn-99. This has been a fantastic role for Lo Truglio, giving him a chance to really shine as the food-loving eccentric detective.

Lo Truglio starred in 2 episodes of Community at the end of season 4, playing Jeff's ex-colleague and friend, Mark. The first was Heroic Origins, an episode in which Abed tries to piece together the group's origin story on 'The Crazy Quilt of Destiny', a large chart he drew depicting the events of their lives before Greendale.

In the episode, it is shown that Mark is the one who told Jeff that he was being disbarred after it was revealed he had never received his undergraduate degree. Lo Truglio returned the next week, in the season finale Advanced Introduction to Finality. He comes back to offer Jeff a job at his new firm on the eve of his graduation. Jeff ends up turning the job down and Mark never returns to the show.