A lot of people, because we called it Age of Ultron and there was a book called Age of Ultron recently, assumed that was the storyline we were doing which is not the case, he said, speaking to Movieweb. Were doing our own version of the origin story of Ultron. The other thing is in the origin story, there was Hank Pym, so a lot of people assumed he was going to be in the mix, but hes not because were basically taking the things from the comics for the movies that we need and can use  a lot of good stuff has to fall by the wayside.

Ultron was their chief villain when I read the book and he has been THE Avengers villain for so long I was amazed anybody was surprised it was going to be him in a movie, he said. But were sort of crafting our own version of it, where his origin comes more from The Avengers that we already know about it. Since before I even took the job of making the first one, I thought Well I don't know if I want to make this movie, but the second one should have Ultron in it.

It's a little bit darker than the other film, because Ultron is in the house, there's a science fiction element that I think is a little bit stronger than the other film. Getting the team together was so rousing, but seriously, keeping the team together is a completely different problem.

Ultron is definitely somebody who evolves so we're going to get a couple of iterations, it's going to be cool.

Part of the fun for me, definitely, this time around is writing Hawkeye, because he did get possessed pretty early by a bad guy and sort of had to walk around scowly for most of the movie last time," he said. So now it's nice to actually have the character there and really see him interact with the other guys.

It's very much a global Avengers film, a lot of the movie has to do with their place not only in America but in the world.

End of February, beginning of March, he said. We'll be shooting in London, London will be the base for Avengers 2.

Joss Whedon shared some details for the forthcoming The Avengers sequel at the San Diego Comic-Con this past weekend, shedding further light on the films plot and characters. The sequel  entitled Avengers: Age Of Ultron  was revealed in the convention's Hall H, and is slated for release on May 1, 2015. However, the writer-director has chosen to take different tact to the recent book edition of the same name, revealing that the plot involving Ultron will be different in his adaptation and the movie won't include Ant-Man.Whedon admitted he had chosen Ultron as the sequels villain before he made the first film, and that he couldnt believe how surprised people were when he unveiled the title in Hall H.When asked about how the film would differ from the first movie, Whedon elaborated far more than he has in the past, saying Ultrons involvement will mean a slight tonal shift.The man behind Buffy the Vampire Slayer said he was enjoying writing the film, finding himself spoiled for choice by how to write the villain because of the wealth of differing source materials available. He said:Yet though the former Serenity helmer said he was having fun writing new characters, its one of the older ones who caught his eye for the second Avengers script  namely, Jeremy Renners Hawkeye.When asked by a fan whether the Avengers would be going aborad after the last films extended stint in America, the creative mastermind replied in the affirmative.In-keeping with the global theme, he then revealed when production for the highly-anticipated film would begin, stating that filming would begin on British, not American shores.