While testing an experimental space craft, Reed Richards, Ben Grimm, and Sue and Johnny Storm were exposed to a bombardment of mysterious cosmic rays. Upon their return to Earth, they found that they had gained wondrous abilities, the likes of which had never been seen before. That voyage was the first of many extraordinary adventures for these friends who became known to the world as Mr. Fantastic, The Thing, the Human Torch, and the Invisible Girl - the Fantastic Four!
Reprints Fantastic Four #1-20 and Fantastic Four Annual #1. Included are the first appearances of the Fantastic Four, Doctor Doom, Skrulls, Miracle Man, Namor (in the Silver Age), Puppet Master, Alicia Masters, Mole Man, Impossible Man, Red Ghost, Mad Thinker, Super Skrull, Rama-Tut and the Molecule Man.
— Description from Comic Vine community (comicvine.gamespot.com).