The Geddis brothers are a pair of New York-based gangsters who conspired with Megatron and the Decepticons to hire low-level criminals throughout the city (including Raoul) to steal cars for them. When Raoul failed to deliver a car as promised on schedule, they found him in an alley and roughed him up, until Tracks arrived to save his human friend. The Geddis fled and eluded Tracks in the tangle of Manhattan traffic.
When they had accumulated 500 cars, they delivered them to a secret base in the Pine Barrens of New Jersey. The Decepticons had promised them a million dollars for their work, but the "million bucks" ended up coming out of the business end of Megatron's fusion cannon. The Geddis fled into the woods and were not seen again.
The Decepticons converted the stolen cars into drones for a massive attack on New York.