Description:

In 2004, Optimus Prime is alerted to a disturbance at the gates of Autobot City; a force of Decepticons led by a vicious new enemy, a Tyrannosaurus rex calling himself Megatron!! Autobots and Decepticons from across the eras have converged on this time to clash over the newly-discovered energy source solitarium!

Alternative Titles:

TRANSFORMERS ROBOT MASTERS (トランスフォーマー ロボットマスターズ), Transformers: Robot Masters