Published Jun 1968 by Marvel.
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Cover pencils by Jack Kirby, inks by Joe Sinnott. The Silver Surfer, Galactus, and Crystal (of the Inhumans) guest star in Worlds Within Worlds!, script by Stan Lee and Jack Kirby (co-plot), pencils by Jack Kirby, inks by Joe Sinnott; Reed, Ben, and Johnny battle their dopplegangers, created by Galactus, who is determined to learn the location of the Silver Surfer. Reprinted in Marvel's Greatest Comics # 57. 36 pgs. $0.12. Cover price $0.12.