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The year is 2005, and the Decepticons have retaken Cybertron from Optimus Prime and his Autobot warriors. Whilst the Autobots prepare to launch an offensive to re-take their home world, the Decepticons - led by the maniacal Megatron - stage a surprise attack and decimate the Autobots' Earth base, resulting in massive casualties on both sides. However, a new enemy is on the horizon, an enemy the likes of which, no Transformer has ever seen before. That menace is Unicron, a gigantic robot with the ability to transform into a small moon; capable of devouring whole planets to fuel his desire for unlimited power. With Unicron fast-approaching, and the heroic Autobots in peril, one must rise from within the ranks and use the Autobot Matrix of Leadership - the only power that can end Unicron's terrifying reign of destruction.
Featuring a stellar cast of voice actors, this was the penultimate cinematic performance for the great, Orson Welles (it was the last job he worked on, however) and the last performance from Scatman Crothers (The Shining).