Even though Megatron has returned and a couple of allies have fallen, the Autobots and the Maximals, with help from the G.I. Joe have once again gained victory. But after the Decepticons retreat to Cybertron, Decepticon scientist Shockwave, who held down the fort in their absence, tells his leaders that Dark Energon was found on Earth, and so they make a plan to retrieve the Dark Energon before the Autobots discover. After retrieving a sample, Megatron resurrects a few fallen minions (Shatter, Dropkick, Scourge, Battletrap, Blitzwing, Nightbird) to outnumber the Autobots once again. It's all in attempt to please Unicron in conquering the Solar System. When the Autobots and the GI Joe finally discover Megatron's evil plan, they decide to find more allies, even if they have to MAKE some, like... Drumroll please... The DINOBOTS! This story could elements from the Generation 1 series, "The Transformers: The Movie (1986)", and the "War for Cybertron" series.
