Brains

Brains is a drone from the Dark of the Moon portion of the live-action film series continuity family.

Hello to you, too, sir.

The Decepticons constructed a "brain unit" drone to receive a very important download, but the drone gained sentience somehow and is now running around Earth calling himself "Brains." Trouble is, the Decepticons want him back.

Brains gets along well with Wheelie.

Fiction

Dark of the Moon film

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An autobot resembling brains was seen with optimus, ratchet, ironhide and bumblebee during the theatrical trailer when optimus was complaining about the humans lying to them.