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 Commercial," "Virgania Horsen's Hot Air Balloon Rides," and "First Coughs."

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."

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."

Tracy Morgan returns to SNL for his second hosting stint while Demi Lovato makes her second appearance as musical guest. Sketches include Democratic Debate Cold Open, Tracy Morgan Monologue, Brian Fellow's Safari Planet: A Beaver and a Camel, Yo! Where Jackie Chan at Right Now? and Astronaut Jones: The Martian.