Later, Optimus pursued Megatron to Earth to stop him from pillaging the planet's energy resources. Prime's loyal team of Autobots clashed with Megatron's Predacons on many occasions, stopping their schemes with the aid of Koji, a human whose father had been abducted by the Predacons. Prime and Koji went on to form a strong friendship, although Prime blamed himself for Koji's father's abduction. Optimus proved his bravery on many occasions, battling and defeating Sky-Byte in an underwater duel and personally rescuing Side Burn from a Predacon trap. Later, when Megatron targeted a tanker truck to scan as the alternate mode of the final protoform, Optimus Prime leaped into action in order to save the truck's human driver and, as a result, the tanker, Prime and the human were all scanned. With an infusion of Megatron's spark energy to complete the concoction, Scourge was born, emerging from his pod as a dark twin of Optimus Prime. Prime's pleas to make Scourge remember his original Autobot loyalties fell on deaf ears.