第 3 集: Ash 在挫敗 Team Rocket 的盜竊企圖時，成功收服了他的第一隻寶可夢 Caterpie

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Ash discovers and catches a Caterpie—his first Pokemon capture! Though Ash is excited, Misty is grossed out by Bug-type Pokemon, so she is repulsed by its attempts to be friends with her. At night, as Ash and Misty sleep, Caterpie shares with Pikachu its dream of evolving into a Butterfree. The next day, Ash is able to capture a Pidgeotto after battling it with Pikachu. Before Ash can celebrate too wildly, Misty reminds him that his success is due more to luck than skill. Team Rocket shows up to steal Pikachu—they realize that there's really something special about this Pokemon—and Ash vows to defend himself. Pikachu and Pidgeotto are weakened by Koffing and Ekans, so he reluctantly sends out Caterpie. To the surprise of Jessie and James—not to mention Ash—Caterpie's String Shot is able to defeat the Team Rocket Pokemon, including Meowth! When Misty tries to make nice with Caterpie, it evolves into a Metapod. Could a Butterfree Evolution be far behind? (Source: Official site)