Madame Gasket is the overarching antagonist of Robots. She is the queen of the Chop Shop, Ratchet's mother and Bigweld's arch-nemesis who destroys spare parts and turns them into upgrades and she told Ratchet to get rid of Bigweld.
Add actors/actresses and cast the roles/films/series that they were rumored, considered, offered, negotiated, auditioned, turned down, and/or originally casted before getting recasted. (Please double-check in research.)