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Marvel teases next Avengers movie in new trailer

Get a glimpse at the upcoming movie's robotic villain, Ultron, as he threatens humanity and challenges earth's mightiest heroes.

Ultron is not a happy robot. YouTube/screenshot by Lance Whitney/CNET

Avengers, assemble! It's time for a new trailer for the next movie featuring the mighty but sometimes dysfunctional team of superheroes.

Due out in May 2015, "Avengers: Age of Ultron" is the sequel to the hit 2012 movie "The Avengers" directed by Joss Whedon. The first film brought together Iron Man, Captain America, Thor, the Hulk, the Black Widow, and Hawkeye as they faced an army of alien invaders in New York City. As seen in the new trailer, the threat in the next movie is an army of robots with a leader that seems to harbor a huge grudge against humanity and the Avengers.

Released Wednesday, the trailer to "Avengers: Age of Ultron" starts off with Ultron menacing the Avengers and calling people "puppets, tangled in strings." After catching a few of the Avengers on their own individual quests, we get a quick glimpse of Quicksilver and the Scarlet Witch, two Marvel comic characters who briefly appeared in a post-credits scene at the end of "Captain America: The Winter Solder."

The trailer then reveals an entire group of Ultron-inspired robots, with the Avengers looking a bit worried about this latest peril. Tony Stark then proclaims: "It's the end. The end of the path that I started us on."

And as usual, the Avengers still can't quite get along with each other. We see Thor grab Stark by the throat, and Stark himself, in his new Hulkbuster armor, square off against the Hulk. The trailer shows us Captain America's shield battered and broken and ends with Ultron saying: "There are no strings on me."

Ultron is well-known to Marvel fans. In the Marvel comics universe, Ultron is an android created by Hank Pym (aka Ant Man, aka Giant Man, aka Yellowjacket), who's a founding member of the Avengers. In the comics, Ultron sees humanity for the imperfect creatures we are and wants to wipe us out. In countless encounters, it's up to the Avengers to stop him.

In the Marvel movie universe, Hank Pym is not part of the Avengers, though he's slated to appear in his own "Ant Man" movie in 2015. Advance word on "Avengers: Age of Ultron" suggests that Stark will have something to do with the creation of Ultron, and that the robot will come back to bite the hand that fed it. The movie will also feature the debut of the Vision, another android-based character in the Marvel comics universe, who is created by Ultron but ultimately joins the Avengers as an ally.

"I'm going to show you something beautiful," Ultron says at one point. "Everyone screaming for mercy."

"Avengers: Age of Ultron" crashes into theaters on May 1, 2015.