Chris Elliott and Gerard Mulligan drop by to promote their new project, "Bionic Guy"; 7-11 head honcho Jim Keyes comes up with another wacky promotion; Chaka Khan sings "Love Me Still."

Howard Stern and Ayo are the scheduled guests.

Nicolette Sheridan, Tony Snow, and Rihanna are the scheduled guests.

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Lance Armstrong, Kristen Wiig, TV on the Radio

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Dave welcomes actress Debra Messing, actor Josh Hutcherson, and musical guests Oberhofer. The "Smash" star discovers a lot of fake Debra Messings on Twitter.

From "The Wolf of Wall Street", director Martin Scorsese; from "Girls", actress Allison Williams; musical guests Cults.

Dave welcomes actress Megan Mullally, comedian Joe Wong, and musical guest Band of Skulls.

Day 3 of "Tribute Band Week" with Mr. Brownstone. Plus, Katie Couric!

Dave welcomes actor Martin Short and musical guests The Ting Tings. Martin upsets a famous female broadcaster and her husband (but it's not Connie Chung and Maury Povich).

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Comic Kathy Griffin; from "Zero Dark Thirty", actor Chris Pratt; Big Boi performs.

Dave welcomes actor Ed Helms, sportscaster Dan Patrick, and musical guest Lyle Lovett.

Tonights guests include Steve Carell, Chris Russo and Band of Horses perform “Is There A Ghost.”

Senator John Edwards, Diablo Cody, and Josh Ritter are the scheduled guests.

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Dave's beard gets a key to the city, courtesy of Mayor Bloomberg; a wayward WGA picketer wanders around in the backdrop; Hal Gurnee's latest Network Time Killer is a "balloon drummer"; Ellen Page plugs Juno; Roger Bart, Sutton Foster, and Chris Fitzgerald perform a song from the musical "Young Frankenstein."

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Stephen Colbert and Kristen Stewart are the scheduled guests.

A very pregnant Demi Moore is given the honor of throwing the first pencil through the backdrop windows of the Late Show.

Tom Hanks interrupts the monologue because he and Dave are dressed alike; throughout the night, spelling bee champ Edmund Gillette stands next to Rob's desk and spells words; during Mailbag, Alan Kalter reacts badly to a letter asking if he's a freak by visiting the letter-writer (Jay Johnson) and punching in his face; Tom gets a new suit.

Dave shows a tape of stunt biker/scheduled guest Travis Pastrana's mishap that afternoon, and the injured daredevil later hobbles onstage. By the end of the show, the Hi-Ho Girls are helping Travis repair his bike.