VIDEO: The Cast of AVENGERS: INFINITY WAR Sing THE MARVEL BUNCH On THE TONIGHT SHOW

The cast of Avengers: Infinity War sing their own version of "The Brady Bunch" theme song, "The Marvel Bunch."

An unprecedented cinematic journey ten years in the making and spanning the entire Marvel Cinematic Universe, Marvel Studios' "Avengers: Infinity War" brings to the screen the ultimate, deadliest showdown of all time. The Avengers and their Super Hero allies must be willing to sacrifice all in an attempt to defeat the powerful Thanos before his blitz of devastation and ruin puts an end to the universe.

Anthony and Joe Russo direct the film, which is produced by Kevin Feige. Louis D'Esposito, Victoria Alonso, Michael Grillo, Trinh Tran, Jon Favreau, James Gunn and Stan Lee are the executive producers. Christopher Markus & Stephen McFeely wrote the screenplay.

"The Tonight Show" returned to its New York origins when "The Tonight Show Starring Jimmy Fallon" made its broadcast debut from Studio 6B in Rockefeller Center. Emmy Award- and Grammy Award-winning comedian Jimmy Fallon brings a high-tempo energy to the storied NBC franchise with his welcoming interview style, love of audience participation, spot-on impersonations and innovative sketches.

An American television institution for almost 60 years, "The Tonight Show" continues to be a home to big-name celebrity guests and a stage for top musical and comedic talent. Taking a cue from his unforgettable predecessors, including hosts Johnny Carson and Jay Leno, Fallon carrys on the tradition that audiences know and love - kicking off every show with the iconic "Tonight Show" monologue.

Watch the hilarious clip below!

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