Alex Ross' version of the original Secret Wars cover, but with alternate reality characters from across the Marvel multiverse. I doubt it will take the members here too long to identify everyone. As ever, please try to include an image of the identified character, and in this instance it is obviously important to identify the reality (by commonly used colloquial name or CCD number).

Numbered version, to make it easier to clarify who is being identified.

1 Machine Man; 2020A.D. (Earth-8410)
2 Bamf; Kitty's Fairy Tale (Earth-5311)
3 Matt Murdock. Agent of S.H.I.E.L.D.; Earth-8181
4 Irving Nebbish; Crazy (Earth-80360)
5 Captain Mahr Vehl; Ultimate Universe (Reality-1610)
6 Brute (alternate Reed Richards); Earth-616 Counter-Earth (High Evolutionary's)
7 Nighthawk; Supreme Power (Earth-31916)
8 Man-Spider; Earth-7840
9 "Starbrand Reed Richards" of the Council of Reeds; Earth as yet unidentified
10 Captain Americat; Larval Earth (Earth-8311)
11 Spider-Man; Earth-80219 (What If Spider-Man Had Never Become a Crimefighter?)
12 Windrider (alternate Storm); Kitty's Fairy Tale (Earth-5311)
13 Thing; Earth-82821 (What If the Thing Were Blue?)
14 Hawkeye; Heroes Reborn (Counter-Earth (Franklin))
15 Wild Thing; MC2 (Earth-982)
16 Gaard (alternate Johnny Storm); Earth-721
17 Czar Colossus; Earth X (Earth-9997)
18 She-Hulk (Lyra); Femizonia (Earth-8009)