Hector, Wordsworth and Mungo decide to teach Heathcliff a lesson after a typical day of being picked on. That night when Heathcliff is fast asleep, the cats sneak into his house, and with Hector dressed like a ghost, frighten Heathcliff into promising to be nice to his friends. After a few days of being good, Heathcliff finally catches on and puts his sneaky friends back in their place. / Riff Raff goes with Cleo to the museum to look at dinosaur bones. Riff Raff is accidentally knocked unconscious while jumping on one of the displays, and while he is out, dreams of many wild adventures in prehistoric times.