The five founding members of the Avengers first banded together when Loki, the Asgardian God of Mischief, attempted to discredit the monstrous Hulk in order to draw his half-brother, the thunder god Thor, into battle. Loki was trapped in Asgard due to his brother's actions but still able to manipulate Midgard. Loki tricked the Hulk into destroying a railway line. Rick Jones, the Hulk's friend, radioed the Fantastic Four for help, but Loki instead relayed the information to Thor to draw him out in the open. However, Iron Man, the Wasp, and Ant-Man also received the radio signal unbeknownst to Loki and arrived at the scene, attempting to reason with the Green Goliath. Not falling for the trick, Thor confronted Loki and exposed his scheme to the others. Defeating Loki, the group agreed they worked well together and should formalize the team. The Wasp suggested the name "Avengers" and a legend was born.
The newly formed team assembled a short time later at the midtown Manhattan mansion of industrialist Anthony Stark (in reality, their fellow member Iron Man). Stark soon donated the mansion to the Avengers for their exclusive use, and set up a foundation to cover all the operation expenses of the nonprofit team under his mother's name, creating the Maria Stark Foundation. The team put down a charter and bylaws to govern their operations. The Stark family's trusted butler Edwin Jarvis was kept on as the principal regular domestic employee at what became known as the Avengers Mansion.
When the Hulk proved to be uncontrollable, a new member was discovered when battling Namor the Sub-Mariner. The legendary Captain America had been in suspended animation, frozen in ice since just before the end of World War II. Needing to adjust to the world he awoke in, Captain America joined the heroes. A born leader, the living legend was given retroactive "founding member" status in place of the Hulk, and was seen until his death as the heart and soul of the team.
Cap's Kooky Quartet: