Billy got a 2 in a test what happened to him for the first time. Otherwise he gets only one. To be admitted to the science club, he must get a 1 in the next test. Trini helps him with learning. Meanwhile, Jason, Kimberly and Zack are tied up by Goldar and Rita releases her Grumble Bee. Now Billy and Trini have to face the monster alone. And then Billy is poisoned by the monster.