"It's about why we ended up in this place." Transwarp said. He explained, as best he could, the theft of an Earth artifact called "The Golden Disc" and how a Predacon named Magatron, after the famous Decepticon leader, and a band of Predacons took it away from Cybertron and were pursued by a group of Maximals led by a descendant of Optimus Prime.
A long time had passed until Predacon Megatron suddenly returned and proceeded to invade and conquer Cybertron using some kind of virus that knocked out most of the population. Those that disappeared afterwards were only seen again as unfeeling, sparkless, mindless Drones whose numbers increased as more people vanished.
Transwarp explained he and his friends were looking for a way off Cybertron so they can live in peace without fear of being hunted down and becoming Vehicons.