Avengers

The Avengers are a team of superheroes, Earth's Mightiest Heroes, based in New York City. Led by Captain America and including such members as Iron Man and Hulk, they are the Earth's foremost defense against superpowered threats. The team was originally headquartered in the Avengers Mansion, but after its destruction the team has moved into Stark Tower, now called Avengers Tower.

Known members of the Avengers

 * Steve Rogers/Captain America (Leader)
 * Tony Stark/Iron Man
 * Thor Odinson/Thor
 * Clinton Barton/Hawkeye
 * Natasha Romanoff/Black Widow
 * Samuel Wilson/Falcon
 * Scott Lang/Ant-Man

Reserve Members

 * Peter Parker/Spider-Man
 * Dr. Robert Banner/Hulk

Former Members

 * Arsenal (deceased)

Enemies

 * Zzzax
 * Hydra
 * Johann Schmidt/Red Skull
 * Blood Brothers
 * A.I.M.
 * George Tarleton/M.O.D.O.K.
 * Vladimir Tepes Alucard III/Dracula
 * Attuma
 * Loki Laufeyson/Loki
 * Wrecking Crew
 * Thanos
 * Victor von Doom/Doctor Doom
 * Squadron Supreme
 * Ultron
 * Mangog
 * Fin Fang Foom
 * Space Phantoms
 * Jormugand/Midgard Serpent
 * Ulik
 * Super-Adaptoid
 * Mojo
 * Mary MacPherran/Titania
 * Galan/Galactus
 * Carl Creel/Absorbing Man
 * Circus of Crime
 * Black Order

Equipment

 * All Members
 * Quinjet (destroyed)
 * Aven-Jet Prime (destroyed)
 * Avengers ID Card
 * Sky-Cycle
 * Iron Man
 * Iron Man's armor
 * Captain America
 * Captain America's Shield
 * Thor
 * Mjolnir
 * Hawkeye
 * Hawkeye's Bow and Trick Arrows
 * Black Widow
 * Black Widow's Gauntlets
 * Falcon
 * Red-Wing Armor
 * Redwing
 * Spider-Man
 * Web Shooters
 * Ant-Man 
 * Ant Helmet
 * Pym-Particle Blaster
 * Size Alteration Suit

History
In the early days since their formation, the Avengers encountered and fought Molecule Man, a short but difficult battle they won.

At some point in time, the Avengers split up and went their separate ways; the reason being unknown. It's unknown who else was in the Avengers prior to the series; because when Steve Rogers took over as leader he tells the others that the Avengers were coming back, handpicked by him. Meaning that there were more members then the seven current members.