The Powerpuff Girls S01E11 - Just Another Manic Mojo / Mime For A Change

"JUST ANOTHER MANIC MOJO"  When the girls accidentally knock their baseball into Mojo Jojo's lair, he does everything he can to keep them there so he can set up a trap, but they keep getting distracted by his inventions and wind up making a mess of the place.  /  "MIME FOR A CHANGE"  An accidental bleach spill turns Rainbow the Clown into the malevolent Mr. Mime, and he proceeds to turn Townsville black and white (and silent) and dead all over (except Bubbles, who is already in color). The thought of a colorless world has the girls seeing red, and before he knows it, Mr. Mime's number is up.