Matt Damon surprised Jimmy Fallon viewers with an unexpected late-night appearance that introduced a brand-new alter ego.

Although Karoline Leavitt has been on maternity leave, her absence hasn't left her out of the minds of her critics, like Jimmy Fallon who took a shot at her on The Tonight Show

The unexpected performance sparked fresh attention online and even drew a response from the original band behind the song.

Jimmy Fallon recalls his unforgettable first encounter with a 17-year-old Kobe Bryant.

Jimmy Fallon was almost in disbelief over the number of hats 20-year-old director Kane Parsons wore to bring to life the new horror box office hit, "Backrooms." During Thursday's broadcast for "The Tonight Show,

Jazz Chisholm Jr. took his talents to The Tonight Show Starring Jimmy Fallon on Monday. With the Yankees off on Monday -- they’ll begin a three-game set against the Guardians at Yankee Stadium on Tuesday -- Chisholm made an appearance with Fallon at his usual set in Manhattan’s Rockefeller Center.

NBC’s late-night program The Tonight Show Starring Jimmy Fallon is hosted by comedian Jimmy Fallon and is the seventh installation of the Tonight Show franchise. The show features The Roots as the house band and is broken up into segments including comedic sketches,

The TV host is following Jimmy Kimmel’s lead by opting not to air a new episode on May 21, the same night Colbert brings his 11-season run on 'The Late Show' to an end Todd Owyoung/NBC via Getty; Scott Kowalchyk/CBS Jimmy Fallon is standing with Stephen ...