Mister Fantastic, the Human Torch, Invisible Girl and The Thing -- all given extraordinary powers after a spaceflight through cosmic radiation -- make their comic-book debut in Marvel's answer to DC's Justice League of America.
* Entry from marvel.com: @
* Series history from www.comics.org: @
* Series history from comicbookdb.com: @
* JC's Fantastic Four site: @
* "The Science of Superheroes" (book by Lois H. Gresh, Robert Weinberg): @