Nightstick
On the X-Men/Avenger side we have
Hulk
Thor
Captain America
Gambit
Rogue
Phoenix
Scarlet Witch
Hawk Eye
On the JLA side we have
Plastic Man
Flash
Wonder Woman
Aquaman
Batman
Green Lantern
Martian Manhunter
Superman
The fight takes place in a random city unfamiliar to all of them.
Hulk
Thor
Captain America
Gambit
Rogue
Phoenix
Scarlet Witch
Hawk Eye
On the JLA side we have
Plastic Man
Flash
Wonder Woman
Aquaman
Batman
Green Lantern
Martian Manhunter
Superman
The fight takes place in a random city unfamiliar to all of them.