What\'s the episode with the old uniforms?

You are thinking of the most commonly asked about Real Ghostbusters episode, Citizen Ghost , describing the events after the first movie explaining how Slimer saved the guys lives and came to live with them. Peter forgets to burn the old uniforms leaving them next to a crack in the containment unit. Green ghost clones of the Ghostbusters appear with one goal, to destroy the Real Ghostbusters and replace them!