We have already been re-introduced to the principal Avengers - Iron Man, Thor, Captain America, Black Widow and The Hulk - who will be back in the Age of Ultron. But it is time we got introduced to the two new characters - Scarlet Witch aka Wanda Maximoff and her brother Quicksilver aka Pietro Maximoff.
The two characters who are mutants and also appear in X-Men franchise will be making their debut in the Avengers franchise with this film.
The trailers have already revealed that The Twins will not always be on the side of good. In fact, in trailer number 3, we see them spreading some serious destruction in cahoots with Ultron's minions before they switch their allegiance to Avengers.
Scarlet Witch, who will be played by Elizabeth Olsen, has the power to warp reality and of telekinesis. Quicksilver will be played by Aaron Taylor-Johnson and he, as the name suggests, has the ability to break into a high speed.