Transformers: War For Cybertron

It is the waning days of the Great War on Cybertron before the Transformers come to Earth. Megatron, genuinely believing a caste system will bring Cybertron back to its Golden Age, is researching a dangerous power source known as Dark Energon to fuel his conquest of the planet. Megatron discovers that the factory that produces Dark Energon is guarded by a neutral army led by Starscream, and he leads an attack on the station. After his ship crashes into the hull of the station, Megatron, Brawl and Barricade defeat Starscream's army and harness the power of the Dark Energon. Cornered, Starscream tells Megatron that he's the only one who knows how to make more of the energon and that he will help the Decepticon leader if Megatron takes him into his army. Megatron reluctantly agrees to this. Doing this also causes Jetfire to lose trust in Starscream and warn Zeta Prime of their ambitions.

Megatron sends the Seekers to reactivate the ancient Energon Bridge that will produce new Dark Energon. After encountering Autobot security probes, strange jelly-fish-like life forms, and fighting legions of Autobot defenders, they succeed. They then start the assault on Iacon.

With his new powers, Megatron takes the fight straight to the Autobot's capital city. While Starscream and Brawl lead the main attack on the city, Megatron takes Soundwave and Breakdown on a flanking attack to recover the Omega Key, which will allow him to access the core of the planet. Arriving at the key's holding place, the Decepticons learn that the Autobot leader Zeta Prime has taken it to keep it safe. The team regroup with Brawl and Starscream, and use Dark Energon bombers to eliminate the remaining Autobots before storming the building in which Zeta Prime is waiting. Megatron defeats the Autobot leader, stealing the Omega Key and punching a hole in his chest. Zeta reveals that the key Megatron has just stolen only activates the real Omega Key, and that soon it will find him. Suddenly a huge ship awakens and takes off.This is the autobots last line of defense.

The Decepticons descend into the impact crater to loot Omega's remains, but he transforms into robot mode, unleashing his full barrage on the squad. Megatron manages to corrupt Omega with Dark Energon, using him to reach and corrupt the core of Cybertron with Dark Energon. The planet itself is now under control of the decepticons.

In a decimated Iacon, the young Autobot messenger Bumblebee is sent to tell the soldier Optimus that Zeta Prime is dead. Optimus decides to take temporary control of the Autobots, adopting Bumblebee into his team. The two of them and Ratchet kick off a counterattack to push out Decepticon forces. They manage to reactivate the planetary guns, clearing the skies over Iacon, and proceed to aid Ironhide in reclaiming the Decagon, tangling with Starscream along the way. Entering the Decagon, Optimus receives a message from Zeta Prime, revealing that he is not yet dead but is being held in a prison in Kaon. Optimus gathers up a bunch of Autobots to rescue their fallen comrade.

Optimus' first task as Prime is to cure the currently infected core. Heading to the entrance, where Omega Supreme is being held by the Decepticons, the three Autobots manage to free Omega, then call in Ratchet to repair him enough to open the Omega Gate. Thanks to the help of some space slugs, Prime, Warpath, and Ironhide defeat a corrupted space slug and reach the core. However, the core tells Optimus that, in order to repair itself, it will have to shut down for millions of years, forcing Optimus and the Autobots to evacuate Cybertron. Before the core shuts down, it gives Optimus the Matrix of Leadership. A vessel of pure energy and the collective wisdom of the primes.

Returning to Iacon, Optimus Prime orders the launching of a full-scale evacuation of Cybertron's surface. However, as the transports leave the atmosphere, Megatron begins shooting them down with his massive orbital space station. Optimus relizes the need to shut down the station, and sends a group of fliers to shut it down from the inside out. The team manages to blow up the power core, but Megatron taunts them as he activates a back-up generator. Then the station itself begins to mock them. Realizing the station is a Cybertronian, the team flies to find its conversion cog to force it into its robot mode before it can finish leveling Iacon, and Optimus with it. Succeeding, the Autobots race out of the quickly transforming space station as it reveals itself to be Trypticon. The Autobots shoot out the massive Decepticon's jetpack, causing it to hurtle towards the surface of the planet. Meanwhile Optimus and the others decide to finish off the bot themselves down there.

All seems quiet as Optimus and others search the wreckage, but soon a very much alive and enraged Trypticon emerges to wage a long and difficult battle with the Autobots. After targeting key weaknesses, Optimus uses his axe to knock Trypticon off-balance, sending it plummeting into the liquid below. As the other transports escape the planet's dying surface Optimus shows his team their new ship - an Ark that will allow them to take a piece of Cybertron with them, wherever their adventures may take them... So begins the end of cybertron and the departure of the transformers.

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