In the inaugural episode, Jimmy Fallon gives the four kid hosts -- Mykal-Michelle, Recker, Olivia and Dylan -- tips o...

Dancer, singer and actress JoJo Siwa joins the show, shares why she's proud of being her authentic self this year and...

Questlove and Black Thought - members of "The Tonight Show" house band - join to reminisce about how they met in high...

Popular online creators and well-known pranksters Brent and Lexi Rivera, Jeremy Hutchins and Pierson Wodzynski of AMP...

"NBC Nightly News" anchor Lester Holt joins the show and shares a funny story about how he couldn't stop giggling dur...

Popular online creators Charli and Dixie D'Amelio join the show and reveal the best and worst parts of working togeth...

Magician Dan White stops by the show and performs some crazy and unforgettable magic tricks; one of the hosts gets cu...

"Frozen" actress Kristen Bell joins to talk about the inspiration behind her new book and to show off her weirdest ta...

Activist, model and star of "Grownish" Yara Shahidi joins the show to talk about her cool karate skills; pointless PS...

Real-life astronaut Mike Massimino joins the show to talk about being in space and plays a fun game of Globe Grab.

Singer-songwriter and "Clash of the Cover Bands" host Meghan Trainor plays a hilarious game of All About that Bass an...

Yo-yo world champion Gentry Stein shows off some of his most awesome tricks, plays a crazy game of Velcro Madness aga...

"Annie Live" stars Celina Smith and Tituss Burgess talk about their upcoming musical and play the craziest game of Bo...

Olympic skateboarding champion Bryce Wettstein kickflips into the show and answers a jaw-dropping question from a sur...

"Saturday Night Live" legend and "Kenan" star Kenan Thompson joins the show to talk about his favourite impressions a...

YouTube star Nastya and online looping genius Marc Rebillet join the Pajama Party episode.

Miranda Cosgrove of "iCarly" joins the show for some random dancing; actor Matt Damon answers the silliest questions ...

"Glee" star and author Chris Colfer joins the show for a lightning round of questions with Young Dylan; National Spel...

Actors Matthew McConaughey and Nick Kroll join to talk about the inspiration behind their "Sing 2" characters; adults...

Dancer and actor Pressley Hosbach joins the show to talk about her time on "Dance Moms" and "Stage Fright"; Pressley ...