3. Tom Hanks - 30 Rock
Episode Appeared: 100 (Season 5) I expected the 100th episode of this show to be filled with cameos and appearances but when Tom Hanks came onto the screen I almost fell out of my seat. I'm a huge fan of Hanks and seeing him on the small screen every once in a while is definitely a treat. The cameo had Hanks playing himself, upon witnessing something Tracy does while watching television he calls George Clooney and tells him to 86 Tracy from the "Official A-List." 30 Rock was riddled with a huge amount of cameos throughout its run but only a few shine brighter than the rest and this is definitely one of those few.