Moved by a compulsion to not only witness Ragnarök but also be the one responsible for it, the Scarlet Centurion killed Odin.

The Asgardians believed their king's assassin to have come from Midgard, for which they waged war against the Earth. As a result of their very first raid, the Asgardians claimed the lives of each and every hero. Some of the few remaining humans, the agents of S.H.I.E.L.D., travelled back in time and prevented Odin's murder, causing this reality to diverge into Earth-616.[1]

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