Live from New York, it's... Fred Armisen!

Sketches include "Gadhafi's Second Speech," "Bladdivon," "Flight Attendants," "Russian Brides," "SWAT Commander" (Digital Short), "Grady Wilson's Burning Up The Bedsheets," "Live Lounge," "Biker Chick Chat," "Megan's Roommate" (Digital Short), and "Your Mom Talks to Megan Fox While You Get Ready."

U2 performed "Breathe," "Moment of Surrender," and "Ultraviolet (Light My Way)."

Live from New York, it's... Fred Armisen!

Sketches include "Obama's Checklist," "Mostly Garbage Dog Food," "Celebrity Family Feud," "Throw It On The Ground" (Digital Short), "Mike's Fountainry," "Deep House Dish," "So You Commited a Crime... And You Think You Can Dance?," "International Masterworks," and "Bubble Dresses Backstage."

Lady Gaga performed "Paparazzi" and a medley of "LoveGame," "Bad Romance," and "Poker Face."

Live from New York, it's... Fred Armisen!

Sketches include "Obama's Nobel," "Gilly and Gigli," "Celebrity Ghost Stories," "University of Westfield," "La Rivista Della Televisione," "Tampax to the Max Ladies' Billards, 1991," "Cooking Al Fresco with Fran and Phil," "Larry King Live," "Brenda and Sean" (Digital Short), and "Debbie Turner Book Signing."

Regina Spektor performed "Eet" and "The Calculation."

Live from New York, it's... Dwayne Johnson!

Sketches include "The Return of 'The Rock' Obama," "Fuquay Satin's Grand Hoochie Skank Rose," "Game Time with Randy and Greg," "Beauty and the Beast," "300," "What's Up With That?," "Trina at the Ad Agency," and "Daveheart."

Shakira performed "She Wolf" and "Did It Again."

Live from New York, it's... Kristen Wiig!

Sketches include "Fox News Election Coverage," "Carter n' Sons BBQ," "The View," "Firelight" (Digital Short), "Hollywood Dish," "Teens Raising Awareness About Awful Parent Drivers," "Penelope at the Wedding," "Scared Straight," "Best Friends," and "Bunny Business."

Taylor Swift performed "You Belong To Me" and "Untouchable."

Live from New York, it's... Jason Sudeikis!

Sketches include "Biden's in Control," "Today," "Rear Window," "WIIX," "A Lady's Guide To Throwing a Party" (film), "Dr. Jekyll & Mr. Hyde," "Toilet Encounters" (Digital Short), and "Cloud Watching."

The Black Eyed Peas performed "I Gotta Feeling," "Meet Me Halfway," and "Boom Boom Pow."

Live from New York, it's... Nasim Pedrad and Will Forte!

Sketches include "Obama and Hu Jintao," "Movie Trailer Re-Cut: Palin 2012," "Secret Word," "A Girl Like Reba" (Digital Short), "The Mellow Show," "What's Up With That?," "Thanksgiving Dinner," "Woman To Woman," and "Say Anything."

The Dave Matthews Band performed "You and Me" and "Shake Me Like a Monkey."

Live from New York, it's... Fred Armisen, Bobby Moynihan, and Kristen Wiig!

Sketches include "Obama and the Salahis," "Carter 'n Sons," "Vagisil Superstars of Bowling Tournament 1989," "The Situation Room," "Shy Ronnie" (Digital Short), "Gossip Girl: Staten Island," "10th Annual Kickspit Underground Rock Festival," "Virginaca Hastings at Barney's," "UPS" (two parts), "Late Night with Chris Hansen," and "NASA Recruitment Office."

Rihanna performed "Russian Roulette" and "Hard" (featuring Young Jeezy).

Sketches include "Gov. Sanford, Sen. Ensign, and Sen. Edwards," "Rose Bowl Shoot," "Sue and the Baby," "A Message from the PGA Tour" (three parts), "Middle School Jingle Jam," "Twilight Science Partners," "Yogurt Shop Flirting," and "Doorbells and More."

Bon Jovi performed "Superman Tonight" and "When We Were Beautiful."

Live from New York, it's... Fred Armisen and Kristen Wiig!

Sketches include "The Lawrence Welk Show," "What Up With That?," "The Kissing Vogelczeks," "The Tizzle Wizzle Show" (Digital Short), "The Manuel Ortiz Show," "Sigma Lambda Omega," "Vincent Price Christmas Special," "Tree Love," "Christmas Gift Meeting," and "Mark Wahlberg Talks to Christmas Animals."

Muse performed "Uprising" and "Starlight."

Former basketball star Charles Barkley comes back (after a 17-year gap) to host the first new episode of 2010; Alicia Keys (who last appeared on the first episode of season 27 with host Reese Witherspoon) comes back to perform "Try Sleeping with a Broken Heart" and "Empire State of Mind."

Sketches include "The Situation Room," "Thomas Peepers Insurance," "Reel Quotes," "MacGruber" (three-part sketch), "Shana at the Ski Retreat," "Inside the NBA," "Weekend Update" with James Carville, Nicolas Cage, and Governor David Paterson, "The Haney Project," "Digital Short: Alicia Keys' Booty Call," "Scared Straight," and "Barkley's Bank."

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."

Sketches include "State of the Union Cold Open," "Jon Hamm Monologue," "1920s Party," an SNL digital short: "The Curse," "New Senator," "Sports Show," "Hamm and Buble," "Closet Organizer," "Court Stenographer," "Bar" and "Barnes & Noble."

Actor Ashton Kutcher hosts; Them Crooked Vultures perform "Mind Eraser, No Chaser" and "New Fang." Sketches include "On the Record w/ Greta Van Susteren," "Gertrude's Will," "The View," "Cialis for Threeways Commercial," "Roman Slave Boy," "Weekend Update" with guests Liam (a teenager who just woke up), Eliot Spitzer, Jean K. Jean, and Garth and Kat, "What Is Burn Notice?" "Access Hollywood's Oscar Coverage," "An Even-Tempered Apology from Rahm Emanuel," and "Wedding Band.

Actor Zach Galifianakis hosts; Vampire Weekend performs "Cousins" and "Giving Up the Gun."

Sketches include "Health Care Reform," "The Vogelchecks," "Bidet," "Zach Drops by the Set," "Today," "Weekend Update" with guests Mo'Nique and Will Forte, "What Up with That?" "The Situation Room," and "Pageant Talk."

Actor Jude Law hosts; Pearl Jam performs "Just Breathe" and "Unthought Known."

Sketches include "Eric Massa's Exit Interview," "Ford Commercial," "Secret Word," "Broadview Security," "Seville," "Digital Short: Boombox," "Weekend Update" with guests Whoopi Goldberg and Jerry Seinfeld, "The Twilight Zone," "Hamlet Auditions," "Kickspit Underground Rock Festival," "Court Stenographer," and "Talk Show with Ravish."

Sketches include "Obama Census Cold Open," "Brownie Husband," "Masters," "Sarah Palin Network," "Teacher," "Weekend Update," featuring Jason Sudeikis as the devil, "Women's News with Tina Fey," "Ruff, Rugged and Roker," "School Dance" and "Lolene."

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Actress Gabourey Sidibe hosts; MGMT performs "Flash Delirium" and "Brian Eno."

Sketches include "A Message from the President of the United States ," "The Suze Orman Show," "Who Wants to Be a Millionaire?" "Mrs. Johnson," "Digital Short: Cherry Battle," "I Did It in My Style," "Weekend Update" with guests Judy Grimes, Stefon, and John Mulaney, "Public Employee of the Year Awards," "Alarm Clocks and More," and "Hamilton."

Sketches include "Lawrence Welk Cold Open," "Betty White Monologue," "NPR," "The Manuel Ortiz Show," "Gingey," "Weekend Update," featuring Molly Shannon as Sally O'Malley and Betty White as Dottie Donigan, "Scared Straight" and "Census 2010."

Sketches include "BP Oil Spill Cold Open," "Alec Baldwin Commencement Monologue," an SNL digital short: "Great Day," "Arizona Evenings," "Swim Team Awards," "Grady Wilson," "Timecrowave," "Some Big Shot" and "Snipers."