Transformers: Dark of the Moon

Brains is a drone, formerly known as the Brain Unit.

IDW Publishing

The drone calling itself Brains ran away from the Decepticons and runs into Bumblebee and Sam Witwicky in Philadelphia.

Books

Brains appears in novelization of Transformers: Dark of the Moon. During the battle with the Decepticons Wheelie and Brains take over a Decepticon ship and use it against the Decepticons.

Brains appears as a character in the Transformers: Dark of the Moon The Junior Novel

Transformers: Dark of the Moon The Junior Novel

Transformers: Dark of the Moon: The Junior Novel is an adaptation of the 2011 film Transformers: Dark of the Moon written by Michael Kelly. For younger readers the violence featured in the movie is scaled down considerably and the book features a different ending than the one seen in the film to...

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Movie plot

In Transformers: Dark of the Moon, Wheelie and Brains are kept as 'pets' by Sam Witwicky. Brains is more perverted than Wheelie, and likes bothering Carly. He helps Sam and Simmons find two former cosmonauts who are hiding in America. During the battle in Chicago, he rides with the Wreckers and cheers as they ride into battle. He and Wheelie are accidentally left behind, but find a crashed Decepticon fighter and fly it to the main Decepticon battlecruiser, where they sabotage the ship, saving Bumblebee and the other captured Autobots. The ship crashes in the water, and their survival is a mystery.

However, the last lines said by Wheelie and Brains: "We had a nice one Brains, you and me" and "Yeah, we're gonna die", along with the fact that they are not shown again in Dark of the Moon, unlike the other surviving Autobots (in the end), hint that perhaps both of them did not survive.