15. Steve Martin
Years on Show: He wasn't a cast member, but he hosted 15 times between 1976 and 2009.
Most Memorable Sketches: "King Tut," "The Festrunk Brothers," "Steve Martin's Penis Beauty Cream," "Theodoric of York," "Medieval Barber"
Post-Show Career: This is non-applicable since he was never a cast member of the show to begin with, but he's obviously been a successful movie star for decades. In recent years, he's devoted more time to bluegrass music and writing books.