Energizer Butter

Energizer Butter is an episode from season three.

Plot
Baby Butter stumbles upon a leftover Energizer battery and accidentally swallows one. You might expect her to die, but you're wrong. Instead, she transforms into a sunglasses-wearing drum-beating endless runner dubbed "Energizer Butter". This further augments Lisa's interest in catching her for examination. Unfortunately, for her and the rest, it will be a long journey from point A to point B.

Trivia

 * Devo do not appear in this episode.
 * Orphie is a mad scientist in this episode.
 * Rydia's cameo has her making electrical circuits.