Fantastic Four #75 (June 1968)
Art by Jack Kirby & Joe Sinnott
Words by Stan Lee
Puzzling over what happened to the Silver Surfer, Reed, Ben and Johnny are attacked from afar by Galactus. Galactus uses the very forces of nature and artificial constructs of Reed, Ben and Johnny to force them into leading him to the Silver Surfer. However, when they refuse to tell, Galactus threatens to drop a planetoid on Earth. Faced with total annihilation, Reed concedes telling Galactus that they will find the Silver Surfer. Returning to the Baxter Building, Johnny sees that Reed had left out his notes regarding the Microverse, realizing that this is where the Surfer had gone, they prepare a device that will allow them to travel to this realm.