Dion

Dion was an Autobot and friend of Orion Pax nine million years ago. They worked together at the same energy depot. When Megatron attacked the depot, Dion was badly wounded. His ultimate fate is unknown.

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It has been widely suggested that Dion was saved by Alpha Trion, as Pax was, and turned into a warrior robot. Among the Autobots theorized to be a rebuilt Dion are Ironhide and Ultra Magnus.