Star fails her first test, so she tries to play matchmaker for their math teacher Miss Skullnick to get a better grade. However, she winds up turning her into a troll. When Ludo and his minions attack, one of the monsters falls for Skullnick.

Marco breaks his arm before a karate tournament. Star uses her wand to fix it, but transforms it into a tentacle arm. As Star tries to find a spell to reverse it, Marco begins to like his new powers associated with the arm. However, the arm harbors an evil sentience that intends to take over the world.