A fight for the title of best team.
X-Men:Cyclops,Magneto,Wolverine, Domino,Emma,Cable, Psylocke, Kid Omega, Beast, Kitty Pryde, Rogue, Northstar, Colossus(juggs), Namor, Magik, Danger, Nightcrawler(aoa), Iceman, Storm, Gambit,X-Man, Cannonball, Box,Nemesis,Havok,Zero, Deadpool,Jubilee(vamp) Warpath, X-23, and Dust.
Avengers:Captain America, Thor, Ironman(any armor), Black Widow, Spiderwoman,Daredevil, Spiderman,Hercules, Wonder Man, Hawkeye, Luke Cage, Ironfist, Hank Pym, Valkyrie, Black Panther,She Hulk,The Vision, Ms. Marvel, Red Hulk, Mockingbird, and War Machine
JLA:Superman, Wonder Woman, Flash, Cyborg, Aquaman,Hawkgirl,Hal Jordan,Zauriel,Ray, Dr.Light, Orion, Big Barda,The Atom Batman, Green Arrow, Booster Gold, Vixen,Geo-Force, Black Canary, Red Tornado, Captain Marvel, Martain Manhunter, and Black Lightning.
1)X-Men has to save the world from Thanos,Hyperion,and Sinestro within 2 months.
2)Avengers has to save the world from Darkseid, Vulcan, and Loki within 2 months.
3)JLA has to save the world from Proteus, Dr. Doom, and Brainiac within 2 months.