Live from New York, its... Al Gore! Sketches include "Parallel Universe Address from President Gore", "Techpack", "Horny Homeless Guy", "The Morning Show", "MySpace", "Charades", "Unsolved Mysteries: The Sandy Patterson Story", and "Peyote" (film). Paul Simon performed "How Can You Live In the Northeast?" and "Outrageous".

Live from New York, it's... Steve Carell!

Sketches include "Pounder School Commencement Ceremony," "The Democratic Primaries," "Deal or No Deal," "Two A-Holes Do Karaoke," "The Japanese Office" (Digital Short), "McCain 2008," "The Charlie Flitt Show," "American Red Cross," and "Bless This Child."

Usher performed "This Ain't Sex" and "Love in This Club, Part 1" (featuring Young Jeezy).

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Sigourney Weaver comes back to host SNL after a 24-year gap between appearances (her first appearance was the 12th season premiere in 1986). Indie rock band The Ting Tings perform "That's Not My Name" and "Shut Up and Let Me Go."

Sketches include "Larry King Live," "Grady Wilson's Fifty and Freaky," "Summer's Eve Lady Stars of Darts Championship 1988," "Digital Short: James Cameron's Laser Cats 5," "Disco Booty Junction," "Weekend Update" with Larry the Goose and Meryl Streep, "Avatar," "Riley," "Sigourney Weaver's Internet Addiction," and "Fire and Rice."

Rihanna performs "What's My Name" and "“Only Girl (In The World)"

Sketches include Biden Cold Open, Jon Hamm Monologue, An SNL Digital Short: Ronnie And Clyde, Vincent Price Halloween, Back To The Future Screen Tests, I Didn't Ask For This, Highway Cops, Darlique & Barney, Dog in Purse