Beast Wars: Transformers 2

Centuries after the Cybertronian Wars, a small rebel group of criminal Predacons pursuing a group of heroic Maximal explorers crash-land on a primitive world. They assume native animal forms to protect themselves from the planet's rife amounts of energy, transforming into robots to do battle. As the Maximals fight to stop the Predacons from conquering the galaxy with this strange world's power and seek a way home, they are discovering the majesty of its wilderness and the threat posed by its mysterious alien caretakers.