A Tiny Egg / Little Rubble, Big Trouble

S2 E12: After Wilma (voice of new series star ELIZABETH LYN FRASER) discovers an egg, the gang decides to adopt it. Pleased at first when an adorable Brontosaurus hatches, the kids are soon forced to make a major decision when their little pet grows into a giant nuisance. Terrorized by bully Rocky, Barney goes to Philo's house to hide. He accidentally drinks Philo's experimental growth formula, transforming him into a large, hairy monster. It's up to Philo to restore Barney to normal.