Thundercracker lives on fear. Special materials in his vehicle body allow him to emit controlled sonic detonations that can be heard 200 miles away. Cruising along at Mach 6, he wants his enemies to hear him before they see him. He wants them to know he's coming, and cower in fear at their impending doom. Not as devoted to the recovery of the Allspark as the other Decepticons, he stays with Megatron because the evil leader allows him to indulge his chaotic tendencies.