Aunt Agatha

Aunt Agatha is the main antagonist of Double, Double, Toil and Trouble. The aunt of Christine Farmer, the twins' mother, she is the evil twin sister of good Aunt Sophia, whom she has trapped into the mirror and cast in the netherworld. According to a spell she has placed her in for seven years, on the last of those years, Sophia will be doomed to the netherworld by the mirror cracking unless the magic of twins breaks the spell. Like her sister, Aunt Agatha is portrayed by Cloris Leachman. Ashley Olsen portrayed her as a child.