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Neil Patrick Harris Guest Stars on Cartoon Networks Adventure Time!\r
Titled Adventure Time with Fionna and Cake, the episode is, according to the network, set in a gender-bending, parallel universe. Fionna and her cat Cake are the female versions of the shows main characters, the fearless boy Finn and his magical dog Jake. Harris plays Prince Gumball, the object of Fionnas affection. In this exclusive clip, the prince serenades his lovestruck companion.\r
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