Spells n' Wiztards".
Appearance in "Spells n' Wiztards"Edit
This video is actually Bill Cosby's only appearance in SMG4's bloopers. In this episode, he got summoned by SMG4 at the wizard academy Hobowarts (a parody of the wizard school from the Harry Potter series) during a spell competition held by Dumbledore, when SMG4 tried to summon a Pokeball. Bill never reappeared since, but it isn't impossible for him to appear in a future blooper.