Pokémon: Indigo League

The Battle of the Badge (1x63)

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Ash goes to the Gym in Viridian City, but Gary gets in there before him and challenges the Gym Leader for his own satisfaction, as he has already won ten Gym Badges. The Gym Leader, Team Rocket's commander Giovanni, agrees to the fight, eventually using a never before seen Pokémon (Mewtwo), which the Pokédex cannot identify, to easily defeat Gary. Team Rocket kidnaps and tries to give Togepi to Giovanni, but Giovanni thinks it is useless. Giovanni leaves the Gym with Mewtwo to sort out an emergency and puts Jessie, James, and Meowth in charge. Ash challenges them and wins the battle, but Team Rocket refuses to give Ash the Earth Badge, his eighth and final badge. Togepi sends them blasting off when it plays with the controls, and Team Rocket drops the Earth Badge for Ash to catch.