Justice League Action S1 Ep 29 - Body Swaps

Season 1 Episode 29 Mxy's Mix-Up
As Superman and Batman take Stargirl on a ride-along to protect the United Nations from Gorilla Grodd and his army of gorillas, Mister Mxyzptlk appears and causes chaos by body-swapping the Leaguers. When the Justice League's bravo team and Firestorm arrive and are affected as well, they must find a way to trick Mister Mxyzptlk into saying his name backward and defeat Grodd.