Jack Black Teases 'Jumanji' Theme Song He Made With Nick Jonas

Jumanji  Welcome to the Jungle - Still 2 - Photofest-H 2017
Columbia Pictures/Photofest
The epic song the actor previewed on 'The Graham Norton Show' may not make "the final cut," Black said.

The Jumanji: Welcome to the Jungle score was written by Henry Jackman, but according to star Jack Black, he and a few co-stars have made an addition to the movie's soundtrack.

On The Graham Norton Show on Thursday night, Black claimed that he and Nick Jonas had finalized and shot a music video for a "theme song" for the movie.

"I co-wrote a song — we were all kind of messing around with a theme song — and me and Nick Jonas put the finishing touches on it and we shot a music video, hoping to release it soon," Black told Norton. Black then asked if the audience wanted to hear the song, joking that this appearance might be their exclusive chance to listen. He said he worried the song might not make "the final cut."

On The Late Show with Stephen Colbert a week later, Nick Jonas corroborated that he and Black had made an "unofficial" theme song. He called the tune "obnoxious" and "over the top" before proceeding to sing a few verses.

Black performed his own teaser on The Graham Norton Show. He belted out a song that goes along the lines of: "Jumanji / It's a jungle inside your soul / somewhere deep inside / at the end of the ride." After pausing between verses for applause, Black eventually got the audience to sing along with him.  

Watch Jonas' and Black's full, dramatic performances below.

Dec. 14, 12:41 p.m. Updated with Nick Jonas' performance.