The moment his sensor net registered Megatron going offline, Starscream
knew the battle was over, and the Allspark lost. He converted to
vehicle mode and boosted for outer space, hoping to buy enough time to
rally the Decepticon survivors. Returning from Cybertron bearing the
marks won during his reign over the Decepticon army, he is focused on
conquest. With a new army behind him, he has the strength to pursue his
own goals, and perhaps, when the time is right, bring Megatron back.