Malcolm in the Middle (2000)

S6E17 Butterflies

Malcolm stumbles upon Norm, a man residing in the Lucky Aide, and promises to keep his presence a secret in exchange for insights about his new crush, a coworker there. At the same time, Reese starts working as an exterminator but realizes that to attract clients, he needs to infest local lawns. He decides to use caterpillars for his scheme. However, after some reflection, he has a change of heart and opts to care for the caterpillars instead, which leads him to create his own beautiful butterfly collection.