Once a young robot known as Orion Pax, he was attacked by Megatron, making him into the formidable Optimus Prime. As leader of the Autobots, he has dedicated himself to a life of stopping the Decepticons wherever they attack.

Built one dark night on Cybertron, Megatron has terrorized Autobots ever since. His power appears unmatched except perhaps by Optimus Prime himself. When fully charged, his fusion cannon can kill Transformers with one shot.

Hot Rod becomes Rodimus Prime but reverts back to Hot Rod when he relinquishes the Matrix of Leadership back to Optimus Prime.

Brave, powerful warrior, but often uses underhanded tricks to win. Carries a rocket pack that allows him to fly for short periods. "Brother" of Sunstreaker, but nowhere near as cold-blooded.

Once tried to form his own power base and challenge Megatron's leadership. Also provoked the ire of Galvatron by questioning his trust.

Leader of the Insecticons. Repeats the last word of nearly every sentence he speaks. Able to harvest electricity of storm clouds and reproject them as energy blasts, as well as clone himself and the other Insecticons.

Starscream is Megatron's air commander and second-in-command, but is eager to usurp him as leader of the Decepticons. His scheming has at times cost the Decepticons decisive advantages. Among his arsenal are cluster bombs and a paralyzing null ray.

Often referred to as the "smallest Autobot", Bumblebee often volunteers for missions where his small size is an asset. He also possessed the best eyesight of all the Autobots which made him an ideal scout.

The combined form of the five Protectobots, Defensor, exists specifically to safeguard human life. In many ways he feels about the human race the way a parent would their children and he would give his life away in an instant rather than let one human come to harm. Defensor is emotionally attached to humans on a level that sometimes worries his fellow Autobots. He identifies with them the same way a sheep dog would with its flock or a puppy with its human owners. As far as Defensor is concerned the humans are his "kind". Sadly the titanic robot giant's attempts at personal interaction and friendly exchanges with humans tend to fail. We humans tend to be more wary and frightened of his alien nature and great size than Defensor can understand.

Tough, but impulsive. Frequently calls for battle against Decepticons, and sometimes engages in battle in spite of Optimus Prime's orders. Is also head of security.

Optimistic, punctuates his speech with sound effects (e.g., Wham! Bang!).