Fantastic Four (1961 1st Series) #154

"The Man in the Mystery Mask!" Guest-starring Nick Fury. Written by Stan Lee and Len Wein. Pencils by Dick Ayers and Bob Brown. Inks by Paul Reinman, Frank Giacoia, and Mike Esposito. Cover by Gil Kane and Frank Giacoia.

Reed, Ben, and Johnny are returning to the Baxter Building after their triumph on Machus, when suddenly a most unexpected foe attacks! But before the FF retaliate, the Human Torch recalls his prior battle against a similarly dressed villain in Strange Tales 127. Who is this man challenging the Fantastic Four? 

Cover price $0.25.