The Simpsons: 15 Celebrity Appearances You Might Have Missed

5. Patrick Stewart

Episodes: Homer The Great (Season 6) & The Fabulous Faker Boy (Season 24) Not only did Patrick Stewart play the part of Number 1 from the Stonecutters cult in one of the all-time classic Simpsons episodes, he also appeared 14 seasons later as an unnamed worker at the Nuclear Power Plant in the same episode that starred full-time brat, part-time singer Justin Bieber. After Homer loses the two remaining hairs on his head, he desperately searches for a cover-up, but after they all draw more attention to his new state of baldness, Stewart's character is there with words of comfort. He details all of the exciting experiences he's been able to have as a bald man, and teaches Homer how to cope with his newfound baldness, before the iconic hairs pop back out from his head.