Fantastic Four (1961) #303
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Vowing to serve his country any way he could, young Steve Rogers took the super soldier serum to become America's one-man army. Fighting for the red, white and blue for over 60 years, Captain America is the living, breathing symbol of freedom and liberty.
After being exposed to cosmic rays, Reed Richards, Susan Storm, Ben Grimm and Johnny Storm found they had amazing new powers. Reed Richards found he has the ability to stretch his body in any way he wanted, while Susan Storm can turn herself, objects and other people invisible. Ben Grimm transformed into a rocky, super-strong behemoth and Johnny Storm has the ability to set himself on fire. Dubbed the Fantastic Four, Mr. Fantastic, Invisible Woman, Thing and the Human Torch are Marvel's First Family.
Wounded, captured and forced to build a weapon by his enemies, billionaire industrialist Tony Stark instead created an advanced suit of armor to save his life and escape captivity. Now with a new outlook on life, Tony uses his money and intelligence to make the world a safer, better place as Iron Man.
Seriously wounded, young lawyer Jennifer Walters was given a blood transfusion by her cousin Bruce Banner. Usually in better control of her powers and temper than the Hulk, She-Hulk has been a high profile New York lawyer as well as an upstanding member of both the Avengers and Fantastic Four.
The radiation that mutated Reed Richards, Sue Storm and Johnny Storm into superhuman beings had also mutated Ben Grimm, transforming him into a grotesque, rock-hided strongman dubbed the Thing.
As the Norse God of thunder and lightning, Thor wields one of the greatest weapons ever made, the enchanted hammer Mjolnir. While others have described Thor as an over-muscled, oafish imbecile, he's quite smart and compassionate. He's self-assured, and he would never, ever stop fighting for a worthwhile cause.