A brilliant scientist - his best friend - the woman he loves - and herfiery-tempered kid brother! Together they braved the unknown terrors ofouter space, and were changed by cosmic rays into something more than merelyhuman! Mr. Fantastic! The Thing! The Invisible Woman! The Human Torch!The comics that launched the Marvel Age of Comics are collected here, including the origin of the FF and the very first appearances of the MoleMan, The Skrulls, Doctor Doom, the Puppet Master and the Return of Namor, the Sub-Mariner!