Transformers

Orbiting Alpha Centauri, there was once a planet called Cybertron. On this world, there was no organic life... instead it was populated entirely by sentient machines. The robots belonged to one of two factions... the Autobots and the Decepticons. Both factions lived in peace for centuries until Megatron, leader of the Decepticons made his bid for power. But when Megatron leads a strike force against the Autobot's leader Optimus Prime after the Autobots cleared a field of asteroids threatening Cybertron, Prime forcibly crashes the ship into the lifeless third planet of the system they're flying through. Four million years later, a volcanic eruptions stirs life once more aboard the Ark asit goes about repairing both Autobot and Decepticon alike, leaving them stranded on our Earth.