The Avengers | New Avengers | Other Superheroes | S.H.I.E.L.D. | Supporting Cast | Villains | Season One Antagonists | Season Two Antagonists | The Masters of Evil | HYDRA | Skrulls
The baddies of The Avengers: Earth's Mightiest Heroes encompass several character sheets:
- Season One Antagonists: Loki, the Wrecking Crew, Absorbing Man, General Ross, The Leader, Kang the Conqueror, Klaw, Whirlwind, Man-Ape, MODOC and AIM, Lucia van Bardas, Graviton, The U-Foes, Malekith, the Serpent Society, Ultron
- Season Two Antagonists: Doctor Doom, Technovore, Surtur, the Kree Empire, Crossfire, Korvac, Galactus, Anihilus, Purple Man, Heralds of Galactus
- The Masters of Evil: Baron Zemo, Enchantress, Executioner, Wonder Man, Crimson Dynamo, Abomination, Arnim Zola, Grey Gargoyle, Chemistro, Living Laser
- HYDRA: Red Skull, Grim Reaper, Baron Strucker, Madame Viper
- Skrulls: Queen Veranke, Super Skrull, impersonators
Minor Villains
- All Trolls Are Different: Ulik, who is the giant troll warrior in one of Asgard's Realms.
- An Ice Person: The Frost Giants and Blizzard.
- Blob Monster: Arnim Zola's "Doughboy" constructs.
- Energy Being: Zzzax.
- Evil Redhead: Whiplash.
- Poisonous Person: Radioactive Man
- Intangible Man: Red Ghost.
- Killed Off for Real: Blizzard and possibly Radioactive Man, some of the many victims of the Annihilation Wave.
- Mad Mathematician: The Mad Thinker predicted the mass super-villain breakout would occur before it even happened by writing equations on the walls of his cell.
- Maniac Monkeys: Mandrill and Red Ghost's Super-Apes.
- Our Gryphons Are Different: Griffin is actually a human who was transformed into a creature resembling the mythical creature.
- Pet the Dog: Blizzard is genuinely concerned when the Leader starts to writhe in pain.
- Playing with Fire: The Fire Demons.
- Powered Armor: Blizzard.
- Shock and Awe: Zzzax.
- Stripperiffic: Whiplash has a rather revealing leotard that includes a Cleavage Window and thigh-high boots.
- Took a Level in Badass: Blizzard is notably tougher in "Assault on 42".
- Zerg Rush: Seems to be the favored tactic of the Fire Demons.
