Transformers: Generation 1

The Decepticons steal the key to the Plasma Energy Chamber. The Autobots regain the key, but a volt of Plasma Energy strikes their ship, sending them millions of miles into space. They crash land on a distant planet called Nebulos, where they are captured by a band of rebels who fear that the Autobots are controlled by their mortal enemy, the merciless Hive. But after the Decepticons arrive on their planet and wage a brutal battle, taking five of the Autobots captive, the Nebulans agree to help the remaining Autobots. With his son, Daniel wounded, Spike attempts to merge the Autobots and the Nebulans into a new breed of Transformer known only as the Headmasters.

The operation to merge the Autobots and Nebulans into Headmasters proves to be a success when they go to rescue their captured friends. But the Decepticons join forces with the Hive to become Decepticon Headmasters and Targetmasters. While on Cybertron, Optimus Prime merges with Vector Sigma and he discovers the deadly secret of Plasma Energy. But this information may have come too late for Zarak, evil leader of the Hive, succeeds in converting the Hive's entire city into a Decepticon super robot, the most powerful ever created, the deadly Scorponok.

With his son, Daniel and his friends, the Autobots captured, Spike finds a way to stop the Decepticons once and for all. The answer to saving his son and friends lies in the lost city of the Hive. With the help of Cerebros, Spike changes the lost city into an Autobot Headmaster named Fortress Maximus. Unfortunately, Galvatron opens the Plasma Energy Chamber and its energy overloads the Autobots as well as Earth's sun, causing it to go nova. Now, Spike is the only one who can save the Autobots and the universe by shutting down the chamber.