In Fantastic Four #57, Doctor Doom lures the Silver Surfer to his castle in Latveria and siphons his cosmic power. The Surfer had been left behind on Earth by Galactus after he turned against his master in the Galactus Trilogy (48-50). To punish his herald for his betrayal, Galactus placed a cosmic energy barrier
The FF are powerless to stop Doom as he wields Power Cosmic and wreaks havoc on Earth. Finally Reed comes up with a plan in Fantastic Four #60