Belladonna

BellaDonna is the main antagonist of The Five Masks of Dr. Screem: Special Edition

History
She was thought to be a protagonist, because she sekseemed Monica's help to defeat Dr. Screem, but Screem reveals that Belladonna was the true villain.

Trivia

 * This is similar to Ghost Beach when the kids thought that Harrison Sadler was a Ghost, but the real ghosts we're Sam, Louisa, and Nat..