A recent interview with writer Tim Seeley indicated that the use of Teletran-1 by the Maximals and Predacons during the Beast Wars imprinted itself on the computer, allowing the information to be passed down to other Transformers.
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Optimus Primal appears as a playable character in the fighting games Transformers Battle Universe, a Net Jet game.
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In the final battle between the forces of Optimus Primal and Unicron, the Chaos-Bringer had disappeared (due to the events of Transformers: Energon), with Primal's forces barely making it out.