One year after the events depicted in the 1984 show, humans and Autobots are rebuilding Earth as well as Cybertron. Then all of a sudden Galvatron and Decepticons attack with full force. A mysterious spaceship shows up mid-battle.
Scorponok takes command of the Decepticons, and the Autobot Headmasters must thwart his plan to seize control of an Earth satellite that can harness the energy of the sun.
Spike attempts to negotiate peace with Galvatron, but all is not as it seems as the Decepticons, now joined by the Horrorcons, plan their next evil scheme.
The Decepticons' newest target is the energy-rich Twin Star planetary system, but before the Autobots can come to its defense, the Headmasters are going to have to settle their own arguments first.
The Transformers' interplanetary travels bring them to planet Darhos, where the Autobots aid desperate prisoners in overthrowing the Decepticons and the planet's decadent ruling class. But that's not all - the key to defeating Scorponok is also hidden on this world.
The Decepticons return to Chaar and renew their campaign against Earth. As Galvatron's master plan begins to take shape, Sixshot and Ultra Magnus enter a final one-on-one duel that one of them will not survive.
With Scorponok established as leader of the Decepticons once more and Spike on the verge of death, the fate of Earth hangs in the balance, and only Chromedome can save the day by discovering the long-held secret of Scorponok's weak spot.
With the Decepticons having fled Earth, the Autobots begin the clean-up operation, but things go awry when a discarded bomb threatens the planet's safety. Can the newest Autobot arrivals save the day? And what are the Decepticons doing now?
It's Chromedome and Daniel to the rescue when the Decepticons kidnap Wheelie and ransom him in exchange for the secrets of the Master Sword. But are the Autobots ready for - the Duocons?.
The Autobot Headmasters team up with the young warriors of planet Master for an attack on the Decepticons, but when things go wrong, the Master Sword and the Zarak Shield finally meet in combat.
Separated from their comrades by an asteroid storm, Daniel and Sixshot are thrust together when they become stranded on a dangerous planet, and Daniel discovers that the ninja may not be all that he appears.
Chaos erupts on Earth when the Decepticons return and massive "Death Towers" appear in strategic locations across the planet. Can the Autobots stop Scorponok's final attempt to destroy the world?
With Death Towers all over the planet releasing energy that threatens to tear the Earth apart, everything comes down to a climactic battle between the assembled forces of the Autobots and Decepticons at the North Pole, where Fortress Maximus and Scorponok have their final showdown.
