When Unicron attacks Cybertron in the midst of the chaos caused by a Mini-Con civil war, Sentinel Maximus and Omega Prime fight him off with the help of their allies. In the end Unicron is driven off, badly wounded, by Primus. Unicron appears in a flashback in "The Coming Storm: Part 1". "Ask Vector Prime" later revealed that Unicron's ties to Planet X stretched back years, the planet had once been the remnants of Unicron's body from the events of "The Transformers: The Movie", which were blasted into another universe. Ending up on the edge of the Sol system, Unicron attempted to repair himself but was hindered by the actions of the Megatron of that universe. In response, Unicron reformatted his former victims in order to use them to accelerate his reconstruction; they soon converted him into a dimension-hopping battle station and attacked another reality. However, the Autobots of that reality struck back using the power of Zodiac energy, driving Unicron's lifeforce from Planet X and splitting it in two, creating a paradise world that remained behind in the attacked reality and a damaged husk that was eventually destroyed by the inhabitants of Gigantion.