Avengers assembled: New trailer for superhero blockbuster whips fans into frenzy just over a month before Australian release

Anticipation for the new Avengers film has again been whipped to a fever pitch after Marvel released another trailer containing new footage of "Earth's mightiest heroes" - including one that has never been seen on the big screen before.

The latest trailer for Avengers: Age of Ultron hints at how hard the super-team will be pushed by the titular menace, a robotic villain voiced by James Spader.

Over footage of heroes and villains battling it out in a city reduced to rubble, Ultron voices his own philosophy.

"I was designed to save the world," he says.

"People would look to the sky and see hope. I'll take that from them first."

New footage also shows the Avengers apparently in hiding, including Tony Stark (Robert Downey Jr), Black Widow (Scarlett Johansson) and Thor (Australia's Chris Hemsworth).

Tony Stark, aka Iron Man, is purported to be the creator of Ultron in the film, with the powerful android the result of a global peace-keeping program gone wrong.

However, the heroes will have help from a more benevolent artificial intelligence – the heroic android, Vision.

Vision, who in the comics was created by Ultron, will be played onscreen by Paul Bettany, who in past Marvel films voiced Tony Stark’s artificial intelligence system J.A.R.V.I.S.

The film is the latest in Marvel's series of interlinked superhero films and TV shows and is a direct successor to the hugely popular Avengers movie released in 2012.

It will kick off the studio's "Phase Three" of projects, which will include new films such as Doctor Strange, Black Panther and the first female-headed superhero movie, Captain Marvel.

Avengers: Age of Ultron will be released in Australia on April 23.