'Avengers: Doomsday' trailer sparks WILD theories about Chris Evans' return as Steve Rogers; fans say 'That's NOT Captain America'

The Avengers: Doomsday trailer has sparked fan theories about Steve Rogers.

Fans question his appearance and the reactions of Sam Wilson and Bucky Barnes.

Speculation suggests this Steve Rogers might be a variant, possibly Captain Hydra.

This theory stems from his altered look and the summoning of Mjolnir.

The true identity of Steve Rogers will be revealed in December.