Las Vegas, April 17 -- The makers have unveiled the first full-length trailer for the 'Avengers: Doomsday' at CinemaCon as part of the studio's presentation to theatre owners on Thursday, reported Variety. It was attended by Robert Downey Jr and Chris Evans.

According to the outlet, the trailer starts with a look at Downey Jr.'s green-hooded, metal-faced Doctor Doom as he prepares to invade the multiverse. There's a shot of Professor Xavier (Patrick Stewart) looking out his X-Mansion's window as a bright flash of light is outside, signalling trouble.

It was followed by a flood of crossovers, including Gambit (Channing Tatum) and Shang-Chi (Simu Liu) battle; Mystique (Rebecca Romijn) transforms into Yelena Belova, resulting in a Florence...