"The Man in the Mystery Mask!"
The Fantastic Four are attacked by a strange enemy that never existed. Johnny remembers the first time they faced this enemy, but it was only Reed who was testing them. Now the enemy is real and attacks the FF, but they are able to defeat him. They learn that it is really Nick Fury who is behind the mask. Nick was testing out some new weapons for S.H.I.E.L.D. and using the FF as the test subjects.
Framing sequence around a story reprinted from Strange Tales (1951) #127.
Contains Marvel Value Stamp Series A #100 Galactus.