Agron was a native of Earth's far distant future who fled his endangered Earth in its last days. Agron traveled through time to the modern day, and inhabited a corpse he found in a mortuary. Agron went on a rampage until he was captured by S.H.I.E.L.D. Agron freed himself, overpowering his SHIELD wardens. The resident psychiatrist then convinced the Falcon (who was receiving treatment at the same facility after having been brainwashed by the Night People) to try and subdue the creature. Captain America and Falcon tricked Agron into abandoning its physical form and attacking it in its full energy form, allowing the S.H.I.E.L.D. agents to trap Agron in a containment tube.