Robert Downey Jr. (Photo: WikiCommons/GeorgesBiard)
Robert Downey Jr, who plays William Stark in "Avengers: Age of Ultron."WikiCommons/GeorgesBiard

"Avengers: Age of Ultron" is under production, and with the movie finally shaping up, the plot details have started surfacing.

Warning: Spoilers Ahead

Buzz is that Quicksilver, Scarlet Witch and Baron Strucker, who all featured in the mid-credit scene of "Captain America: The Winter Soldier", will be key to the film's beginning. In fact, "Age of Ultron" takes place immediately after the mid-credit scene of "The Winter Soldier," reported Latino Review.

Moreover, the first scene will show The Avengers attacking Strucker's Hydra outpost. Strucker (Thomas Kretschmann) will defend himself with the help of Loki's staff and the Chitauri weaponry.

Quicksilver and Scarlet Witch also join Strucker to fight against the Avengers. While Scarlet Witch casts a spell on Hulk, the Avengers eventually manage to win and capture the post.

Apart from this it is also being understood that Banner and Black Widow will develop feelings for each other, but the former is hesitant to express these feelings.

These spoilers are based on the comic book version of "Age of Ultron". However director Joss Whedon suggested in his interveiw that the character of the main villian Ultron will have an original form in the film and will not be based on the book.

"We're doing our own version of the origin story of Ultron....We were crafting our own version of it where [Ultron's] own origin comes more directly from the Avengers were already know about," MTV quoted Whedon.

There has also been a lot of buzz suggesting that Ant-Man's alter ego Hank Pym is going to have a major role in "Avengers: Age of Ultron." However, Whedon has refuted these rumours too.

"The other thing is in the origin story there was Hank Pim, so a lot of people assumed he was going to be in the mix, but he's not," he said. "We're basically taking the things from the comics for the movies that we need and can use. A lot of stuff has to fall by the way side."

Whedon also hinted that Ultron is going to have different iterations in the film.

"Ultron has been their chief villain when I read the book. He's been theAvengers villain. I was amazed anybody was surprised it was going to be him in the movie. Since before I even took the job of making the first one: 'I don't know if I want to make this movie but the second one should have Ultron in it," he explained.

"Avengers: Age of Ultron" will release on 23 April 2015.