The series began with a three-part pilot called "Transform and Roll Out!". Stellar cycles (centuries) after the Autobots won the great war for Cybertron against the Decepticons, an Autobot maintenance crew led by Optimus Prime and consisting of Ratchet, Bulkhead, Prowl, and Bumblebee discover the legendary Allspark buried on an asteroid. The Autobots take the Allspark back to their ship, but are soon confronted by a crew of Decepticons led by the notorious warlord Megatron and consisting of Blitzwing, Lugnut, Blackarachnia, and Starscream. Megatron attacks the Autobot ship and tries to retrieve the Allspark, but when an explosive planted on Megatron by the treacherous Starscream detonates, the ship crashes on Earth. The Autobots go into stasis to survive the crash, while the scattered remains of Megatron are discovered by a human scientist named Isaac Sumdac.  Fifty years later, Professor Sumdac is the CEO of a robotics company known as Sumdac Systems, which is based in a futuristic version of Detroit. Optimus Prime and the Autobots awaken from stasis and defend the people of Detroit from a monster, resulting in them becoming local celebrities. They befriend Sumdac's young daughter Sari, who teaches them about Earth customs. At the end of the pilot episodes, Starscream arrives on Earth and tries to take the Allspark for himself, but the Autobots successfully stop him and save the city once again.