Avengers: Age of Ultron is just days away. Joss Whedon's team-up sequel hits theaters on May 1, 2015.

Here's Marvel Studios' official boilerplate for the movie:

When Tony Stark tries to jumpstart a dormant peacekeeping program, things go awry and Earth's Mightiest Heroes, including Iron Man (Robert Downey, Jr.), Captain America (Chris Evans), Thor (Chris Hemsworth), the Incredible Hulk (Mark Ruffalo), Black Widow (Scarlett Johansson) and Hawkeye (Jeremy Renner), are put to the ultimate test as the fate of the planet hangs in the balance. As the villainous Ultron (James Spader) emerges, it is up to The Avengers to stop him from enacting his terrible plans, and soon uneasy alliances and unexpected action pave the way for an epic and unique global adventure.

In addition to the six main Avengers, it's known that at least three new members will be joining their ranks in this adventure, along with several guest appearances by secondary heroes from other Marvel films.

It's a big universe and a lot to keep track of, so here's a quick refresher of where we last saw every major character in Avengers: Age of Ultron, and what their circumstances look like now.

Captain America (Steve Rogers) dismantled Hydra-infested S.H.I.E.L.D. Set off to find Bucky Barnes with Falcon's help.
Iron Man (Tony Stark) underwent surgery to remove the Arc Reactor protecting his heart. Living happily with Pepper Potts.
Thor is protector of the nine realms, but has chosen to spend most of his time on Earth instead of Asgard, where he can be near Jane Foster.
Hulk (Bruce Banner) finally found a place he belongs as a member of the Avengers. Hangs out a lot with his pal Tony Stark.
Black Widow (Natasha Romanoff) testified before Congress that with S.H.I.E.L.D. gone, world governments need to trust superheroes more than ever. Now works solely with the Avengers.
Hawkeye (Clint Barton) was last seen after the Battle of New York. Now works with Avengers only. Could still be dealing with PTSD from his experience with Loki.
  Nick Fury appointed Phil Coulson as director of a new, much smaller and more covert S.H.I.E.L.D. Went into hiding in Europe with only a handful of people aware that he's still alive.
Maria Hill is working for Stark Industries, but occasionally offers a helping hand to Coulson and his team.
War Machine, aka Iron Patriot (James Rhodes) saved the President from Aldrich Killian. Still a loyal friend and ally to Tony Stark.
Falcon (Sam Wilson) helped Steve Rogers take down S.H.I.E.L.D./Hydra. Now assisting in Cap's search for Bucky Barnes.
Heimdall is presumably stationed at the Bifrost once more, following the defeat of the Dark Elves.
Dr. Erik Selvig has reunited with his friends Jane Foster and Darcy Lewis, but still suffers the after effects of a year-long possession by Loki.
Twins Scarlet Witch and Quicksilver (Wanda and Pietro Maximoff) were given superpowers by Hydra thanks to experiments involving Loki's staff. But they had to be imprisoned until they learned control.

All images courtesy of Marvel Studios.

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