Planet X (Transformers)
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Planet X is a planet in the animated television series, Transformers: Cybertron.
Planet X was first seen in a recording found by the human Lori and the Velocitronian leader, Override, after the latter's battle with Scourge on Giant Planet. It was shown to be a highly advanced world like Cybertron, purple in color, with two golden rings around it forming an X pattern.
Later, it would be revealed that Planet X was the dominant force in the alternate universe that Giant Planet had been drawn into. It was capable of non-orbital space travel and annihilating less advanced civilizations it came across. This, however, caused life in its universe to 'die' and, in an attempt to rectify the problem, its denizens sought out another life-rich planet to subjugate. The planet they found, Giant Planet, did not take kindly to being invaded, and its inhabitants reformatted themselves into larger forms with help of the Cyber Planet Key in order to combat the threat of the off-worlders.
Left with few options and little hope of victory, the inhabitants of Planet X powered up their ultimate weapon: a Death Star-like planetary cannon, in order to wipe out the transformers on Giant Planet. Unfortunately, the cannon was too powewrful for them to control and the result destroyed their world.
The survivors, including Soundwave and Sideways, were scattered all across their universe, and were eventually thrown into the Transformers' proper universe. Believing Giant Planet to be at fault for their home planet's destruction, the various Transformers plotted revenge against them. In addition, the Giant Planet Transformers also felt themselves at least partially responsible for Planet X's ahnillation. This created their custom of building cities and then abandoning them, which became a perpetual, planet-wide act of penance.
Eventually, Sideways and Soundwave managed to return to Giant Planet, and sought the Cyber Planet Keys in order to exact their revenge.