A collection of the Multiverse's greatest monsters who cause destruction simply for their own sick appetite.

American Society for the Prevention of Cruelty to Animals

The Aspirants are the loyal servants of the First Firmament. They fought against the rebellious Celestials in a Celestial War but ultimately lost and the First Firmament was shattered into the very first Multiverse.

Breathtaker is the leader of the Assassination Bureau, a mercenary organization. His opperatives included Bazooka Joan, Incognito, Mindboggler and Stratos. The 2000 Committee hired the Assassination Bureau to capture Firestorm, however beaten by Firestorm the group disbanded.

One of the deadliest droids in the Star Wars Universe because of there agile movements and accuracy. They are most often used by the Hutts and other criminal leaders as bounty hunters.

An organization of both highly skilled and superhuman assassins founded by Candra of the Externals.

The Assassins' Guild were hired by Layana Sweetwater to kill Hercules.

A short-lived team assembled by Doctor Doom to battle the Avengers.

Ships of beings who deploy Blackbodies for the Uni-Lord

Astrans are a race of aliens from the planet Astra located in the Mu Cephi star system.

Firefighters who work in Astro City.

These droids are used for more certain tasks like hacking systems and piloting star fighters. One of the most famous one is R2-D2.

Asura`s are known as the Assassins of Heaven . Originally the Asura`s were the members of the bird-men of Akah Ma`at , that became influenced by their leader Varunna and the Elder demon Chthon . They were assigned to judge and execute humans .

Demons in hinduism and buddhism.

Originally a group of 5 multinational humans, the Atari force was brought together to explore the multiverse in their ship, Scanner One, to search for a "New Earth." Later, aliens joined the group.

The DC Comics' Atlantean species members include a wide range of characters such as Aquaman, Mera, Tempest, Kaldur'ahm, Dolphin and Tula.

A water breathing species known as Homo Mermani who occupied sunken Atlantis and built an undersea empire in the Atlantic Ocean.

The Atlantis's Royal Family are the protectors of Atlantis and the Oceans in DC Universe.

An evil society devoted to world domination in the name of the Mongul Empire.

Originally formed from the aftermath of World War III which ended on October 29, 1986 in the Pre-Crisis universe. Their first post-Crisis appearance came after Infinite Crisis.

Wife and Children of the Atom in the Tiny Titans comics

The Atom Rogues are a collection of Ray Palmer's former villains. Chronos plucked them from different events in time in order to pin them against Ryan Choi.

A robotic kingdom that controls much of land. They are also hunting for Jin to prevent the Golden One prophecy.

The Attilan Royal Family are nobility of the Inhuman people with many of their leaders descended from this bloodline.

Old west anti-immigrant terrorists.

The Aurakles are a race of light based entities that formed before time began and emerged in the universe following the Source being split asunder whereupon they began to observe the cosmos. One of their kind animated the dead body of Violet Harper after she was killed and led to her becoming the superhero Halo.

The Authoriteens are a version of the Authority from a world where all of Earth's heroes are children.

The Autobots, led by Optimus Prime, are a benevolent race of living machines. They are the protagonists of the hit cartoon and comic book, The Transformers. They always fight the evil Decepticons to prevent them from taking over the Universe.

The Avant Guard were a group of artisans who had their abilities enhanced and souls bound after amystic ritual. The individual members have encounterded various heroes, but together fought Spider-Man.

The Avatars are a group of reincarnated warriors on the side of light in the world of Mage. They include Kevin Matchstick (King Arthur), The Dragonslayer (Siegfried), The Hornblower (Roland), and others.

People who were taken over by animal avatars.

Six forms of Lord Templar that he is able to released which act independently, each with a different ability.

The Avengers are Earth's mightiest heroes and foremost super-team... "There came a day, a day unlike any other, when Earth's mightiest heroes found themselves united against a common threat. On that day, the Avengers were born - to fight the foes no single super hero could withstand! Heed the call, then - for now, the Avengers Assemble!"

This is the earliest historical version of a team like The Avengers, consisting of the bearers of the Marvel Universe's oldest mantles. They first banded together during the Stone Age to stop a Celestial from destroying the Earth.

A group of heroes similar to Avengers 1,000,000 BC

It's the tail end of the fabulous fifties. NICK FURY and his AVENGERS roar into their secret mission, hunting down NAZI SUPER VILLAINS...;men and women relentlessly preparing to unleash hell on a troubled world barely holding onto peace -- only to find the Avengers have what appears to be serious competition in their manhunt for these escaped ubermenschen...

The Avengers Academy is a program where veteran heroes help train young people with dangerous super-powers and damaged psyches to become valuable heroes.