Adventure Time Super Fans Wiki
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S1e21 donny releasing obnoxygen

Obnoxygen is a gas that Donny omits when he is being a jerk (or as in it's own name, when Donny is obnoxious). After reforming Donny from his mean ways, Finn has to turn Donny back into a jerk so he can use his obnoxygen to stop the Why-Wolves in the episode "Donny" from terrorizing the Housies.

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