Marvel fans have been wondering if Captain America star, Chris Evans, would return in Avengers: Doomsday. The first trailer has only added to the mystery.

The sudden appearance of a cryptic symbol has added credence to one compelling theory about "Avengers: Doomsday."

Marvel Studios had planned a special four-part teaser rollout for Avengers: Doomsday, but the studio faces a setback as three out of the four teaser clips have already surfaced online.

Disney is planning a theatrical rerelease of “ Avengers: Endgame ,” the second-highest-grossing film of all time, on Sept. 25.