The Decepticons constructed Astrotrain as a troop transport, a mundane, thankless job that he was all too eager to abandon when Megatron vanished after the Unicron Battles. Now, Astrotrain is a cunning bounty hunter who lives in extravagant wealth, much of which he has used to upgrade his body into a formidable powerhouse. Despite his haughty cruelty (possibly due to residual bitterness which built up during his trooper transport years), he is extremely loyal to anyone under his command. Although he is ultimately in business only for himself, he does work from time to time with the space pirate Cannonball.