The Avengers time-travel to recruit a younger version of Iron Man. Alternate versions of various characters also turn up.

S.H.I.E.L.D. as you know it may be gone, and that's bad news for Earth and Nick Fury! There's a new danger stalking Nick; to stop it, he must band with trusted allies inclduing Alphonso "Mac" Mackenzie, and the alluring Contessa Valentina Allegra de la Fontaine!