The cast of "The Avengers: Age of Ultron" was in complete attendance at the San Diego Comic-Con. All of them were willing to answer questions pertaining to the movie. However, this wasn't the highlight of the press conference - it was the release of the first official trailer of the upcoming Joss Whedon movie.

Fans who were at the Comic-Con were treated to the official trailer, which hasn't leaked online yet. Marvel Studios is pretty strict about these things. But, this shouldn't stop "The Avengers' movie fans from knowing what's in the trailer.

Movie Pilot shared the juiciest details of "The Avengers: Age of Ultron" trailer. And according to the report, the trailer started with the gang trying to figure out who can lift Thor's hammer. The gang was joking around, but of course, no one could lift it.

Tony Stark guessed that Thor's fingerprints were imprinted on the hammer, which is the reason why he could lift it. Thor gives a better answer, "You're not all worthy," he says.

While having some fun, a ringing sound deafened everyone and next thing you know, Ultron is already in the room with the Avengers. Ultron says "How could you be worthy? You're all killers. You want to protect the world, but you don't want to it to change. There's only one path to peace: your extinction."

After saying his mission, a bunch of robots burst into the room and attack The Avengers. Maria Hill is there too. And then there were shots of different cities shown in rubbles because of Ultron's attack. The Hulk was seen shaking and terrified and the people were scared out of their wits.

Stark looked guilty. After all, Ultron was his creation. Now, the gang is hating on Stark for creating the monster. Hulk beat him and Thor was seen grabbing Stark by the throat and lifting him off the ground.

On the other hand, there were great moments in the trailer too, like Captain America shooting guns, Scarlet Witch using her magical powers, the Black Widow calming The Hulk down and a confrontation between Scarlet with and the Black Widow.

But apart from all these, there's one thing that everyone is asking - who will die in "The Avengers 2?" In the trailer, Stark was seen standing over the bodies of his teammates and it was seen that Captain America's shield was shattered. Whedon did promise a major death in the movie. Who do you think it will be?

"The Avengers: Age of Ultron" is slated for release on May 1, 2015.