Saturday, the 27th of September in 2014, marks the beginning of Saturday Night Live's 40th season. In the first 39 seasons, 768 episodes have come and gone with hundreds of different hosts. Many of those hosts have been invited back, with Alec Baldwin, Steve Martin, and John Goodman each hosting more than a dozen times each. The 40th season will begin with a trio of first-time hosts: Chris Pratt, star of NBC's Parks and Rec and this summer's blockbuster movie Guardians of the Galaxy; Sarah Silverman, comedian and former writer at SNL; and Bill Hader, one of the most popular former-cast members of the last decade. Will they be invited back after their initial show? That's almost impossible to predict, as the show's history includes many hosts who performed at 30 Rockefeller but one time, and never returned to host again. Some, like Martin Lawrence, Adrien Brody, and Steven Seagal have been reportedly "banned" from returning, either by NBC or show producer Lorne Michaels himself. Others, like comedy legends Richard Pryor, Leslie Neilsen, or Milton Berle, only joined the "Not Ready For Primetime Players" once before passing on. And then there are those former hosts like Mary-Kate and Ashley Olsen, Sinbad, or U.S.A. Olympic Skier Jonny Moseley, who hosted and have since fallen out of the limelight (or into obscurity.) Or Miskel Spillman, who won the only "Anyone Can Host" contest held in 1977. The following are ten hosts who added their name to the list of actors, musicians, comedians, and athletes who have hosted Saturday Night Live only once, and have not yet returned for a second engagement... although it is about time that they should. Either their first show was beyond exceptional, their career has taken off (again) since their previous engagement, or they need to perform one last time before the inevitable end of their career (or worse.)