Belladonna is the main antagonist of the third Goosebumps Hall of Horrors book, The Five Masks of Dr. Screem.


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


  • This is similar to Ghost Beach when the kids thought that Harrison Sadler was a ghost, but the real ghosts were Sam, Louisa, and Nat.