When billionaire Simon Stagg sent adventurer Rex Mason to Egypt to retrieve the priceless Orb of Ra from a pyramid, he never expected him to return. Stagg's henchman, Java, attacked Mason, leaving him for dead. But Rex fell into a hidden chamber and was exposed to the Orb, whose radiation changed Mason into the freakish shape-shifting element man Metamorpho.
The Baxter Building is a fictitious 35-story Manhattan office building that served as the Fantastic Four's original headquarters. The landlord, Walter Collins, was initially eager to rent to a superhero team for the publicity and prestige, but soon regretted his decision as the building became a constant target for supervillains beginning with Fantastic Four #6 in which Doctor Doom launched the entire building into outer space.
Green Lantern originally appeared in All-American Comics #16 (July 1940), published by All-American Publications, one of three companies that would eventually merge to form DC Comics. This Green Lantern's real name was Alan Scott, a railroad engineer who, after a railway crash, came into possession of a magic lantern which spoke to him and said it would bring power.
The Scarlet Witch (Wanda Maximoff) and her twin brother Quicksilver (Pietro Maximoff), the children of Magneto, were born without their father's knowledge in the mountains of Eastern Europe. Once manipulated by Magneto into serving the cause of terrorism, they now dedicate their lives to fighting crime.
Crystal -- an Inhuman with the ability to psionically control the four classical elements: earth, fire, air, and water -- was first introduced, along with the rest of the Inhuman Royal Family, in the pages of The Fantastic Four. She immediately fell in love with Johnny Storm and became the first character to join the Fantastic Four (outside of its original members) when Sue Richards went on maternity leave.