Conan O'Brien's taken his show all over the world in the past three years, most recently to Israel.  Starting tonight, he's returning to his old stomping grounds in New York City for a week of shows at the storied Apollo Theater in Harlem. It's his second year in a row in NYC coinciding with the New York Comedy Festival.

Guest this week include Stephen Colbert, Keegan-Michael Key, Will Ferrell, Mark Wahlberg, Mel Gibson and John Lithgow, among others, and on top of all that the show promises fans a special surprise guest.

Tune in to CONAN Monday through Thursday at 11 p.m. ET on TBS for a week full of hijinks from the city that never sleeps.