Transformer Optimus Prime free 3D model. Optimus Prime is a character in comics, cartoons and films about transformers. The leader of the Autobots, robots from the planet Cybertron. Optimus is portrayed as a brave, strong, wise and compassionate leader. He has a strong sense of justice and righteousness and is dedicated to protecting all life, particularly the inhabitants of Earth. His worst enemy is Megatron, the leader of the Decepticons.