One day at Doofenshmirtz Evil Incorporated he built the superevil-inator. Agent P accidentally turned it on and the ray hit Adam. It made Adam so evil that he robbed a bank. Gretchen caught him doing the evil stuff. She got her casual wear (she was with the Fireside Girls at the time), she got her jetpack and not-so-deadly weapons like a whip. Phineas and Ferb built her a back-to-normal ray. She told the story of why she needed it from one part to another. Then she left and went to find Adam and when she found him she got him with the back-to-normal ray. Then h
Gretchen on jet pack

Gretchen finding Adam

e returned everything and Gretchen kissed him and he said, "oh Gretchen!"
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