300th Episode is an episode of season 21 of Greeny Phatom. This episode is all about the Behind-the-scenes footage of the Greenytoons.


This episode takes a mock behind-the-scenes look at GreenyToons Studios, the studio where the Greenytoons are filmed.

This non-canon episode reveals the characters' Japandering (such as Little Guy appearing in a British commercial for Lucozade sports drink, Catgirl appearing with the Clawed Crusaders and Dr. Machstein in a Mexican commercial for Pemex, and Geo Guy doing Japanese commercials for Botan Rice Candy).

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