In order to save the world in Avengers: Age Of Ultron, the heroes from the first movie will need to team up with some new blood.

That brings in Scarlet Witch and Quicksilver, super-powered siblings with great skills but questionable allegiances.

To mark their entry into the Avengers world, Marvel released two character posters on Friday showing actors Elizabeth Olsen, 26, and Aaron Taylor-Johnson, 24, in their new roles.

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New heroes: Marvel released a new Avengers: Age Of Ultron poster featuring Elizabeth Olsen as Scarlet Witch on Friday

Designed in the same style as previously released Avengers art, each of the new posters showed the character exhibiting his or her power.

For Scarlet Witch, aka Wanda Maximoff, Elizabeth gave her character a wary, almost scared look as she worked magic between her hands.

An old-fashioned background of mountains and stone-walled buildings rose up behind her.

Auburn hair long and loose, the Witch was of course dressed in scarlet clothing.

Her brother: In the other new poster, Aaron Taylor-Johnson appeared as Quicksilver

As was fitting for a hero with super-speed, Quicksilver – whose real name is Pietro Maximoff – was given a more dynamic pose for his poster.

Dressed in blue and grey, Aaron’s character almost looked to be exploding out of the frame, with small pieces of shrapnel surrounding him.

A more urban setting was visible, complete with what looked to be flying Avengers in the air behind Quicksilver.

Old heroes: In a poster released previously, Robert Downey Jr.’s Tony Stark faced the menace of Ultron that he helped to create

Leading lady: Scarlett Johansson will reprise her role as Black Widow in the sequel to 2012’s The Avengers

Out of this world: The new threat posed by Ultron might be too much even for an Asgardian like Thor (Chris Hemsworth)

These two new posters joined the seven that had previously been released by Marvel to promote the upcoming comics-inspired sequel.

Iron Man (Robert Downey Jr.), Hulk (Mark Ruffalo), Black Widow (Scarlett Johansson), Hawkeye (Jeremy Renner), Captain America (Chris Evans), Thor (Chris Hemsworth), and Nick Fury (Samuel L. Jackson) have all gotten posters.

In addition to these, the main Avengers: Age Of Ultron poster showed all of the heroes grouped together amidst a raging battle.

Furious: Nick Fury (Samuel L. Jackson) will join in, even after the destruction of S.H.I.E.L.D. and his supposed death

Good guys: All of the heroes seen in The Avengers – like Chris Evans’ Captain America – will be back and will be joined by others

Trouble: With the Earth itself in peril, the Hulk (Mark Ruffalo) will have plenty of reasons to rage

On the right side: Although he was a villain for much of The Avengers, Hawkeye (Jeremy Renner) is likely to remain a hero in the sequel

The upcoming movie reunites the Avengers after Tony Stark’s peace-keeping program goes awry.

With the emergence of the villainous Ultron, the fate of the entire Earth depends on the Avengers saving the day.

Written and directed by Joss Whedon, Avengers: Age Of Ultron will be released in North America on May 1.