Megatron is a massively built, semi-humanoid robot. He towers over his fellow Decepticons; he is nearly 20 feet tall.

He has a massive has a thick barrel-like chest and long powerful legs. The majority of his body is a metallic silver/gray colour, while his hands, trunks are grayish black colour. Megatron's signature is his fusion cannon, a black barrel-like weapon attached to his right arm.

Megatron transforms into a human-sized P38 handgun (complete with a scope, stock and rifle barrel). 