Punisher fighting Green Goblin in Cell Block Alpha in the Prologue

This is the list of bosses in the Marvel Heroes Game

(Credits for this list goes to thatshype from the forums)

Prologue Bosses

Living Laser

Green Goblin

Chapter 1 Bosses

Shocker

Doctor Octopus

Event

Electro

Chapter 2 Bosses

Taskmaster

The Hood

Event

Venom

Rhino

Chapter 3 Bosses

Grim Reaper

Electra

Event

Gorgon

Madame Hydra

Chapter 4 Bosses

Tombstone Bullseye

Kingpin

Event

Mole Man

Green Goblin

Chapter 5 Bosses

Lady Deathstrike

Juggernaut

Event

Mega Sentinel (currently isn't dropping a medal due to bug)

Chapter 6 Bosses

Pyro

Magneto

Event

The Blob

Chapter 7 Bosses

Sauron

Mr Sinister

Event

Sabretooth

Chapter 8 Bosses

Doctor Octopus

Living Laser

Wizard

Modok

Madame Hydra

The Hood

Juggernaut

Grim Reaper

Electro

Mandarin

Doctor Doom