Transformers: Robot Masters

Synopsis

In 2004, Optimus Prime receives a distress signal about trouble at Autobot City's gates. A group of Decepticons, commanded by a new and fearsome adversary calling himself Megatron—a Tyrannosaurus rex—has appeared! Autobots and Decepticons from various time periods have assembled in this era to battle over a newly discovered energy source known as solitarium.