Transformers: Prime: 1x21

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The Decepticons hunt Bulkhead down when he gains possession of the secret formula for synthetic Energon. Unfortunately, the data inside his head is slowly erasing portions of his brain. Unless the Autobots can come up with a solution, Bulkhead will never be the same.

Transformers: Prime: Season 1 Episode 21
Sep. 10, 2011