Watch the explosive first trailer for Avengers: Age Of Ultron

The first trailer for Avengers: Age Of Ultron has been unveiled, scroll down and click to watch it. 

The trailer had been due to debut next week, but Marvel were forced to release it early after it leaked online. 

The preview, which is two minutes and 17 seconds in length, shows a number of explosive action set pieces and promises that the sequel will have a dark, brooding tone. 

We also get our first glimpse of villain Ultron, played by The Blacklist star James Spader, and a more detailed look at newcomers Scarlet Witch and Quicksilver, played by Elizabeth Olsen and Aaron Taylor-Johnson respectively.

Robert Downey Jr, Chris Evans, Chris Hemsworth, Mark Ruffalo, Scarlett Johansson, Jeremy Renner, Samuel L Jackson and Cobie Smulders will alsl reprise their roles in the sequel. 

Avengers: Age Of Ultron is due to be released into UK cinemas on April 24th next year, with the US release coming a week later.