Thunderhoof was a successful crime boss on Cybertron, until Clampdown told the authorities where he was and was arrested and placed in the prison ship Alchemor.  He escaped when the ship crashed on earth and has joined Steeljaw's Pack Thunderhoof was a successful crime boss on Cybertron, with minions like Scowl and Silverhound. However, after Clampdown alerted the authorities of his activities, he was arrested and placed on the Alchemor. He escaped when the ship crashed on Earth.