Walt Disney Pictures has released the official synopsis for Avengers: Age of Ultron, next year's follow-up to The Avengers. The film opens on May 1, 2015.

Something to note in the following synopsis: while most characters are associated with their superhero names, Scarlet Witch and Quicksilver go by their birth names. Outside the films, both characters are stuck between the licensing rights of Disney and Fox, the latter of which currently has the film rights to X-Men. In the X-Men mythos, Scarlet Witch and Quicksilver are both mutants, the children of Magneto and two of the early Avengers recruits, which explains how the characters appear in both movies, but are played by different actors.

Of course, director Joss Whedon has used the characters' superhero names in press tours, so there's no need to fret, true believers. Hm, that's a Stan Lee phrase. Is that owned by Disney or Fox?

Extra weird twist: Elizabeth Olsen and Aaron Taylor-Johnson, who play the siblings in Age of Ultron, played the married couple at the center of this year's Godzilla.

Here's the full synopsis: