Marvel's marketing blitz for its summer superhero sequel Avengers: Age Of Ultron is kicking things up a notch with the advent of a new extended TV spot. With mere weeks left until the blockbuster behemoth storms into multiplexes it's refreshing to witness more new footage unveiled even at this late stage. Avengers: Age Of Ultron opens in the UK on April 23 and the US on May 1. Chris Evans, Chris Hemsworth, Scarlett Johansson, Mark Ruffalo, Jeremy Renner, Don Cheadle, Cobie Smulders, Samuel L. Jackson, Paul Bettany, Aaron Taylor-Johnson and Elizabeth Olsen co-star.