Transformers Energon

Primus is still snoozing, Sixshot overloads the grid and causes a huge explosion that takes down most of the autobots, Cybertron heads for Plains planet and destroys all the planets in its path, Optimus sees/feels Unicron and goes to Cyberton to fight (into the gas). Primus saves Optimus by absorbing the gas and super sizing Optimus Supreme (again) with it.