Brains (Transformers)

Brains is a fictional character from the Transformers series.

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.

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 and 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 sabatoge the ship, saving Bumblebee and the other captured Autobots. The ship crashes in the water, it is unknown if they survived.