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 later escaped and rampaged again, overpowering the Falcon and a number of S.H.I.E.L.D. agents. Captain America and Falcon tricked Agron into abandoning its physical form and attacking in its full energy form, allowing the S.H.I.E.L.D. agents to trap Agron in a containment tube.