Power of the Combination Spark
Galvatron has grown to enormous portions with the power of Unicron growing in him and is headed in to deep space. Shadowing him is a host of Autobots, included Optimus Prime. No one can quite figure out his destination and Optimus sees this as his final opportunity to take down Galvatron once and for all.
Aired 17/12/2004EP 50 - Power of the Combination Spark
Transformers: Energon
It has been 10 years since the fateful battle with Unicron. Many of the Decepticons who fought in the battle against Unicron have joined forces with the Autobos to mine for Energon, an alternate energy source. But a new source of evil has a risen, Alpha Q who plans to steal the Energon from the Autobots with the help of Scorponok and the Terrorcons. This new evil is trying to revive Megatron and Unicron in order to rekindle the old flames of war.
(Source: Anime News Network)