Let's Stop The Time Warp (Again) (http://archiveofourown.org/works/579008) (gen mostly. Janet Van Dyne, Hank Pym and T'Challa play small part, though not as superheroes)
Summary: Steve Rogers has to live the same day over and over. Bruce, Tony, Pepper, Jane, and Thor try to help him. Then things go from bad to worse.
This story includes, but isn't limited to: Bruce and Tony bonding over science, Bruce and Jane bonding over aliens in outerspace, Steve being a Big Damn Hero, Pepper being rather freakishly efficient, Tony talking about sex a lot, action, gore, a world gone wild, Bruce Banner tending wounds, Darcy Lewis doing PR, Pepper's mother, T'Challa, racebent!Janet, racebent!Pym, Lt. Col James "Rhodey" Rhodes, Clint being incompetent with girls, Natasha being a Big Damn Hero, angry mobs, evil corporations, crazy physics shenanigans, and Bill Murray.

Refrain (http://archiveofourown.org/works/885634) (gen and canon pairings. Carol Danvers appears, but not as a superhero)
Summary: Post Iron Man 3, Tony looks into why the rest of his team didn't help him. Mind-control, kidnappings and corruption, oh my.