Stars like Will Ferrell, Matt Damon, Oprah Winfrey and Kermit the Frog all stopped by
Played: Himself, in season 1's "Tracy Does Conan"
The talk show host (another "SNL" alum) doesn't have a ton to do in the episode that named after him — though he and Tina Fey do share a very funny moment where we learn of Conan's romantic history with "Elizabeth" — mostly playing straight man to Alec Baldwin and Tracy "I am a stabbing robot" Morgan. But as the central figure of the episode where "30 Rock" essentially became the "30 Rock" we know, we had to include him on the list.
- Alan Sepinwall