An ongoing list of all Boss Characters.
Key:
- No color: Bosses not in cages
- Yellow: Bosses in cages
- Orange: Bosses that are recruitable
| Portrait | Character | Event |
|---|---|---|
 |
Leader | Gamma Attack! Event, Legends Assemble Event |
 |
Ronan | Guardians of the Galaxy Event, Under Siege Event, Guardians of the Galaxy Vol.2 Event, Cosmic Cataclysm Event |
 |
Madame Hydra | Civil War Event |
 |
Red Skull | Civil War Event, Agents of S.H.I.E.L.D. Event |
 |
Black Knight | British Invasion Event |
 |
Doctor Octopus | Spider-Man Event Quests Act 1 |
 |
The Lizard | Spider-Man Event Quests Act 1 |
 |
Green Goblin | Spider-Man Event Quests Act 1 |
 |
Mysterio | Spider-Man Event Quests Act 2 |
 |
Venom | Spider-Man Event Quests Act 2 |
 |
Carnage | Spider-Man Event Quests Act 2, Under Siege Event, Spider-Man: Homecoming Event |
 |
M.O.D.O.K. | A.I.M Attacks Event |
 |
Punisher | Daredevil Event |
 |
Kingpin | Daredevil Event, Under Siege Event, Luke Cage Event, Hell's Kitchen Halloween Event |
 |
Dracula | Avengers Halloween Event |
 |
Satana | Avengers Halloween Event |
 |
Mephisto | Avengers Halloween Event, Under Siege Event |
 |
Zealot Boss | Doctor Strange Event |
 |
Dweller In Darkness | Doctor Strange Event |
 |
Kaecilius | Doctor Stange Event |
 |
Dormammu | Doctor Strange Event |
 |
Dark Elf Minion | A-Force Event |
 |
Malekith | A-Force Event and Warriors Three Event |
 |
Robo Cap | Ultron Revolution Event |
 |
Jocasta | Ultron Revolution Event |
 |
Ultron | Ultron Revolution Event |
 |
Destroyer | Ultron Revolution Event |
 |
Kang | Young Avengers Event |
 |
Devil Dinosaur | Monsters Unleashed Event |
 |
Orrgo | Monsters Unleashed Event |
 |
Hi-Vo | Monsters Unleashed Event |
 |
Fin Fang Foom | Monsters Unleashed Event, Pet Avengers Event |
 |
Attuma | Legends Assemble Event |
  |
Arnim Zola | Legends Assemble Event, Back to School Event |
 |
Scientist Supreme | Legends Assemble Event |
 |
Collector | Guardians of the Galaxy Vol. 2 Event |
 |
High Priestess | Guardians of the Galaxy Vol. 2 Event |
 |
Ayesha | Guardians of the Galaxy Vol. 2 Event and Warriors Three Special Event |
 |
Thor Noir | Multiverse Special Event |
 |
Keeper Murdock | Multiverse Special Event |
 |
Ghost Rider 2099 | Multiverse Special Event |
 |
Maestro | Multiverse Special Event |
 |
Silver Sable | Spider-Man: Homecoming Event |
 |
Vulture | Spider-Man: Homecoming Event |
 |
Whiplash | Armor Wars Event |
 |
Yellowjacket | Armor Wars Event |
 |
Crimson Dynamo | Armor Wars Event |
 |
Stick | Defenders Event |
 |
Hand Ninja Boss | Defenders Event |
 |
Madame Gao | Defenders Event |
 |
Gorgon | Inhumans Event |
 |
Karnak | Inhumans Event |
 |
Black Bolt | Inhumans Event |
 |
Maximus | Inhumans Event |
 |
Zombie Crossbones | Avengers Halloween Event 2017 |
 |
Zombie Baron Zemo | Avengers Halloween Event 2017 |
 |
Zombie Madame Hydra | Avengers Halloween Event 2017 |
 |
Baron von Strucker | Avengers Halloween Event 2017, Agents of S.H.I.E.L.D. Event |
 |
Korg | Thor: Ragnarok Event |
 |
Miek | Thor: Ragnarok Event |
|
Dark Elf Boss | Thor: Ragnarok Event |
 |
Hela | Thor: Ragnarok Event and Warriors Three Special Event |
 |
Lemurian Boss | Pet Avengers Event |
 |
Lemurian Lieutenant | Pet Avengers Event |
 |
Tiger Shark | Pet Avengers Event |
 |
Chitauri Warrior | Return of A-Force Special Event |
 |
Chitauri Boss | Return of A-Force Special Event |
 |
Proxima Midnight | Return of A-Force Special Event, Infinity War Event, Marvel Rising Event |
 |
Klaw | Black Panther Event |
 |
Abomination | World War Hulk Event |
 |
Kilgrave | Jessica Jones Special Event |
 |
Thane | Infinity War Event |
 |
Thanos | Infinity War Event |
 |
Count Nefaria | Cloak and Dagger Special Event |
 |
Ghost | Ant-Man and The Wasp Event |