Stay Puft Marshmallow Man (voiced by Frank Welker except by John Stocker for episode "Sticky Business") is a former enemy turned ally to the Ghostbusters (mainly Slimer, as it seems he really is the only one he listens to, even though in "Sticky Business", he was shown to be angry when the Phantom stole the Ghostbusters' Proton Packs and even said the Ghostbusters were his friends). The Ghostbusters and Slimer often refer to him as "The Big Guy." He is the only ghost from both movies other than Slimer to receive a toy in the original Kenner toyline.