Red Hot Chili Peppers frontman Anthony Kiedis will sit in with The Roots during The Tonight Show Starring Jimmy Fallon tomorrow night. Guests include Mark Ruffalo and there is no musical guest as U2 was forced to cancel following Bono’s injuries from a cycling accident. The Tonight Show airs at 11:35 PM on NBC.

Last time Kiedis was on the show, he (along with the rest of the RHCP) joined The Roots for a take on Funkadelic’s “Standing on the Verge of Getting it On.” This was also the episode where Red Hot Chili Peppers drummer Chad Smith and Will Ferrell had their long-awaited drum-off. Watch clips from the show here.