Heathcliff's Middle Name / Wishful Thinking

As Heathcliff chases Spike through a grocery store, Sonja meets Wally the Wonder Cat, a movie star she thinks is more "sophisticated" than Heathcliff. When Heathcliff finds out he tries to be more "mature" to impress Sonja. Mungo, while collecting empty milk bottles, accidentally discovers a cat genie named Harry (with the light brown jeans). Meanwhile, an interloper named Claude the Disguiser eavesdrops on the conversation between Mungo and Harry and decides that he wants the last wish (and the power to rule the world) to himself. This is season 1, episode 5.