The Pirates of Dark Water - Season 2 Episode 7 -

Bloth consults a personal soothsayer, who tells him that the best way to get the Treasures is to become Ren himself. Bloth has Morpho create a body-switching potion, which he successfully uses on Ren and Bloth, as well as on Niddler and Konk--they switch bodies, but it turns out not to be that easy