Double, Double, Toil and Trouble In this '90s flick, Mary-Kate and Ashley Olsen portray two sisters who try to recover a moonstone from their evil, greedy Aunt Agatha in order to save her sister Sophia. Unless the twins cast a magical spell with the gem, Sophia will be forced to stay in the netherworld forever. Watch Double, Double Toil and Trouble on Hulu. Image Source: Everett Collection