Vidéo : The Firebird Sweet

When Billy buys a new cereal, a phoenix emerges from the box and attaches to his head, annoying everybody. Since the phoenix can't be removed because it revives every time it is destroyed, Billy, Mandy and Grim seek help by going to the factory where the cereal is produced, which is run by Eris, the goddess of chaos. In the end, Mandy tricks the phoenix into leaving Billy and attacking Eris instead. In the end, it is revealed that all the events were really an episode-within-an-episode.

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S04E22 - The Bubble with Billy