Available Heroes:
Baron Helmut Zemo (Cabal, Hydra*)
Beast (Avengers, Uncanny X-Men)
Black Dwarf (The Black Order)
The Black Widow (A-Force, Avengers, SHIELD)
Captain America, First Avenger (Avengers*, SHIELD)
Captain Marvel, Cosmic Avenger (A-Force, Avengers)
Corvius Glaive (The Black Order)
Crossbones, Merciless Merc (Cabal, Criminal Syndicate, Hydra)
Cyclops (Uncanny X-Men*)
Doc Ock, Sinister Scientist (Spider Foes*)
Ebony Maw (The Black Order)
Invincible Iron Man (Avengers, SHIELD*)
Lady Sif (Asgard)
Loki, Prince of Lies (Asgard*, Cabal, Criminal Syndicate)
Magneto (Brotherhood of Mutants*, Cabal)
The Mighty Thor (A-Force, Asgard*)
Mystique (Brotherhood of Mutants*, Cabal)
Proxima Midnight (The Black Order)
Red Skull, Master of the World (Cabal*, Hydra)
Sabretooth (Brotherhood of Mutants, X-Force)
Spectacular Spider-Man (SHIELD, Web Warriors)
Storm (A-Force, Uncanny X-Men*, Wakanda)
Thor, Hero of Midgard (Asgard*, Avengers)
Toad (Brotherhood of Mutants)
Ultron, Metal Tyrant (Cabal)
Winter Soldier, Operative (Avengers, Cabal, Hydra, SHIELD, Winter Guard)
Wolverine (Avengers, Defenders, Uncanny X-Men, X-Force)
(* indicates that the unit is a team leader.)