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The Cyber Keys, which include the Cyber Planet Keys/Omega Keys are a feature of the Transformers series associated with the Omega Lock.
The Cyber Keys were first featured in Transformers: Cybertron, with each Transformer larger than a Mini-Con possessing a special weapon or feature in robot and vehicle/beast modes that could only be unlocked through use of the objects. The Beast Wars 10th Anniversary figures of Optimus Primal and Megatron also possessed Cyber Key features.
In Cybertron's ancient history, the four Cyber Planet Keys to the Omega Lock were sent to different planets aboard ancient spaceships: one key went to Earth aboard the Atlantis, another went to Velocitron aboard the Ogygia, still another went to Animatros aboard the Hyperborea, and the last went to Gigantion aboard the Lemuria.