Shifter was a henchman (henchghost?) of Pozo, a mafia-type leader of ghosts, in the episode "Partners in Slime". Shifter had been caught by the Ghostbusters, but was brought out of the containment unit when the guys needed his help finding Pozo. Pozo had kidnapped Louis and Janine, and was holding them at ransom, demanding the Ghostbusters turn over the business to him. Peter was covered in mood slime, which was orange instead of pink in this episode, and was accompanied by Shifter to ghost town. At the end of the mission after Pozo was captured, Shifter was set free by the Ghostbusters as a way of saying thanks for the help.