Marvel Studios has released a full synopsis of 'Avengers: Age of Ultron'.

The much-hyped film is set to feature the likes of Robert Downey Jr., Chris Evans, Mark Ruffalo and Chris Hemsworth.

The synopsis of the film reads: ''When Tony Stark tries to jump-start a dormant peacekeeping programme, things go awry and Earth's Mightiest Heroes, including Iron Man, Captain America, Thor, The Incredible Hulk, Black Widow and Hawkeye, are put to the ultimate test as the fate of the planet hangs in the balance.

''As the villainous Ultron emerges, it is up to The Avengers to stop him from enacting his terrible plans, and soon uneasy alliances and unexpected action pave the way for an epic and unique global adventure.''

The synopsis continues: ''Marvel's 'Avengers: Age of Ultron' stars Robert Downey Jr, who returns as Iron Man, along with Chris Evans as Captain America, Chris Hemsworth as Thor and Mark Ruffalo as The Hulk.

''Together with Scarlett Johansson as Black Widow and Jeremy Renner as Hawkeye, and with the additional support of Samuel L Jackson as Nick Fury and Cobie Smulders as Agent Maria Hill, the team must reassemble to defeat James Spader as Ultron, a terrifying technological villain hell bent on human extinction.''

It concludes: ''Along the way, they confront two mysterious and powerful newcomers, Wanda Maximoff, played by Elizabeth Olsen, and Pietro Maximoff, played by Aaron Taylor-Johnson, and meet an old friend in a new form when Paul Bettany becomes Vision.''