Olympic swimmer Michael Phelps hosts the season premiere; musical guest Lil’ Wayne.

Actor James Franco hosts; Kings of Leon perform Sex on Fire and Use Somebody.

Actress Anna Faris hosts; Duffy performs Mercy and Stepping Stone.

Actress Anne Hathaway hosts; The Killers perform Human and Spaceman.

Live from New York, it’s... Gov. Sarah Palin! Sketches include "Palin on Palin," "MacGruber" (three parts), "Sue and the Engagement," "The Suze Orman Show," "Mark and Andy Backstage," "I’m No Angel," "Fart Face," "Narc School," "ReadiTrade.com," "New York Underground" (film), and "Fall Foliage." Adele performed "Chasing Pavements" and "Cold Shoulder."

Live from New York, it’s... Jason Sudeikis! Sketches include "Biden and Murtha," "Pedophile Trick-or-Treater," "Ras-Trent" (Digital Short), "Two A-Holes at an Ad Agency in the 1960s," "The Barack Obama Variety Half-Hour," "Don Draper’s Guide to Picking Up Women" (film), "Vincent Price’s Halloween Special," "Jon Hamm’s John Ham," and "Pat Finger." Coldplay performed "Viva la Vida," "Lost," "Yellow," and the first five seconds of "Lovers in Japan.

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Live from New York, it's... Fred Armisen! Sketches include "The Big Three Automakers," "Clear Rite," "Dateline NBC," "Turkey Chase," "Live Another Death," "Blizzard Man," "Jeff Montgomery," "Dale Britches' Down-Home Phony Phone Calls," and "Mark Payne." Ludacris and T-Pain performed "One More Drink" and "Chopped & Screwed.

Live from New York, it's... Darrell Hammond and Amy Poehler! Sketches include "Secretary Clinton," "Gas Right," "Sexy Shannon," "Obama Keeps It Cool" (film), "La Rivista Della Televisione," "Virgania Horsen's Pony Express" (Digital Short), "Calculators," "The Lost Works of Judy Blume," "Jizz In My Pants" (Digital Short), and "J'Accuzzi." T.I. performed "Whatever You Like" and "Swing Ya Rag" (featuring Swizz Beatz).

Live from New York, it’s... Jason Sudeikis! Sketches include "Blagojevich Testimony," "Bronx Beat," "Sarcastic Christmas Dinner," "Culhane Wedding Toasts," "Magical Lamps," "Cat Christmas Letter," and "Cookie Crimes" (Digital Short). Kayne West performed "Love Lockdown" and "Heartless."

Actor Neil Patrick Harris hosts; Taylor Swift performs Love Story and Forever & Always. Sketches include The Rachel Maddow Show, The Today Show, Save Broadway, Penelope in Group Therapy, Digital Short: Doogie Howser Theme Song, Weekend Update with guests Charles Barkley and Will Forte, Two First Names, Air Traffic Controllers Fran and Freba, Frost-Other People, and Whopper Virgins.

Actress Rosario Dawson hosts; Fleet Foxes perform Mykonos and Blue Ridge Mountains. Sketches include Vice President Dick Cheney: The Final Interview, North American Savings Commercial, Da Learnin’ Train, GuantA namo Bay Liquidation Sale, Aladdin and Jasmine’s Anniversary, Digital Short: A Couple of Homies, Gilly, Weekend Update with guests Bernard Madoff, Judy Grimes, and Larry the Goose, La Policia Mexicana, The View, and Good Excuse!

Actor Steve Martin hosts and performs Late for School; Jason Mraz performs I’m Yours and Lucky (featuring Colbie Caillat). Sketches include A Message from the President of the United States, Chewable Pampers Commercial, The Introverts Go to a Sports Bar, Digital Short: Laser Cats 4 Ever, Issues, Bernie Madoff’s Superbowl Plans, Backstage, Weekend Update with guests Gov. Blagojevich, Angelina Jolie, and Gov. Paterson, Thomas, and Forefathers of the Game.

Actor Bradley Cooper hosts; TV on the Radio performs Golden Age and Dancing Choose. Sketches include Press Conference with Harry Reid and Nancy Pelosi, The Today Show, I’m Gonna Have Sex with Your Wife, Digital Short: I’m on a Boat, Four Singing Guys, Weekend Update with guests Mark Spitz, James Harrison, and BjA rk, Admirals Fan, Bad Guys, Good Conversation, Intervention, and Christian Bale Presents Celebrity Tirades.

Actor Alec Baldwin hosts; Jonas Brothers perform Tonight and Video Girl. Sketches include Republican Congressional Leadership Meeting, The Fourth Jonas Brother, The Cougar Den, Digital Short: The Jonas Brothers’ Secret, Sir Mix-a-Lot’s Photo Shop, Weekend Update with guests Oscar Rogers, Angelina Jolie, Angie Tempura, and Joaquin Phoenix, Vincent Price’s Valentine’s Day Special, Planning a Meeting, Wii, Chewable Pampers, Virgania Horsen’s Hot Air Balloon Rides, and First Coughs.

Actor Dwayne Johnson hosts; Ray LaMontagne performs You Are the Best Thing and Trouble. Sketches include An Address from the Secretary of the Treasury, MacGruber, The Rock Obama, Activia, Hawaii, Weekend Update with guests Michael Steele, Cathy, Irving, Jessica Rabbit, and Jon Bovi, Game Time with Dave and Greg, Celebrity Apprentice Ads, and Lighthouse.

Live from New York, it’s... Tracy Morgan! Sketches include "Tracy Breaks In" (film), "Chewable Pampers," "Brian Fellows’ Safari Planet," "The View," "Scared Straight," "Dateline," "Astronaut Jones," "Big Love," "Party Guests" (Digital Short), "Suppressex," "High IQ," "Family Flix," and "Gas-Right." Kelly Clarkson performed "My Life Would Suck Without You" and "I Do Not Hook Up."...

Live from New York, it's...Fred Armisen! Sketches include: Barack's Business Plan, The Fast and the Bi-Curious, Save the Funnies, La Rivista Della Televisione con Vinny Vedecci, Like a Boss (SNL Digital Short), Botched Presentation, ABC Family: Milestone High, Clancy T. Bachleratt and Jackie Snad Sing Easter Songs about Spaceships, Toddlers, Model T. Cars & Jars of Beer, and The Muppets on the Road

Actor Zac Efron hosts; Yeah Yeah Yeahs perform Zero and Maps. Sketches include Obama Returns from Iraq, Today, Gilly, A Message from The Alliance of Direct Mail Marketers, Underage Bar, Weekend Update with guests the gay couple from New Jersey, blogger Angie Tempura, and Jon Bovi, High School Musical 4: New Senior Class, Soldier Boyfriend, Gino’s Pizza Rolls Commercial Shoot, and Foot Rub.

Musician Justin Timberlake hosts; Ciara performs Love Sex Magic (featuring Justin Timberlake) and Never Ever. Sketches include A Message from Timothy Geithner, Mom Celebrity Translator, Target Lady, Immigrant Tale, Digital Short: Motherlover, Plasticville, Weekend Update with guests David Paterson, Eliot Spitzer, Chris Pine, Zachary Quinto, and Leonard Nimoy, The Barry Gibb Talk Show, and Somalian Pirates.

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