Olympic swimmer Michael Phelps hosts; Lil Wayne performs.

Former "Saturday Night Live" cast member Mike Myers shares some of his favorite sketches, including several performed with late castmates Phil Hartman and Chris Farley.

Steve Carell hosts; GOP presidential candidate Sen. John McCain; Usher performs.

Host Shia LaBeouf; My Morning Jacket performs.

Host Ashton Kutcher; Gnarls Barkley performs.

Host Christopher Walken; Panic at the Disco performs.

Host Jonah Hill; Mariah Carey performs.

Host Amy Adams; Vampire Weekend performs.

Host Ellen Page; Wilco performs.