Transformers: Asteroid of Destruction

"Once, long ago, a race of robotic beings called Autobots were forced to wage war against another race of robots called the Decepticons to bring peace back to their home planet of Cybertron. As the war went on, chance brought both sides to Earth. They crashed so violently on landing that all the robots lay in the Earth's crust, seemingly without life, for over four million years.
Suddenly, the energy set in motion by a powerful volcanic eruption gives them life once more, and the war starts all over again here on Earth. Among the robots' many strange powers is the ability to transform into other shapes, and they use this to disguise themselves to fit in with the civilization they find on Earth.
The Autobots have to defend themselves. They must protect this planet, with all its valuable resources and the people who live here, and they must also build a new spaceship if they are ever to get back to Cybertron."