In order to find out what Libby has been saying about her and Jenny, Sabrina gives her a piece of cake covered with truth sprinkles. However, when her teacher shares the cake with students and teachers, Sabrina finds that the truth hurts.

Sabrina makes three wishes come true for her unsuspecting friends: Jenny gets elected student president, Harvey becomes a football star, and Mr. Pool becomes rich. Soon she learns the truth of her aunts' warnings that one shouldn't meddle with the fate of others: Jenny is crushed when she learns the student president is merely a rubber stamp assistant to the principal, and resigns in favor of Libby, Harvey really can't play football and is injured on the field, and Mr. Pool's success at alchemy turns him into an obnoxious blow hard.