Cover inks credit from Sinnott's personal records.
Part Two (20 pp.) is entitled: "Let Earth Be the Prize!" In the letters page of Sub-Mariner #19 Roy Thomas notes that Bill Everett was colorist for "recent issues" of the Silver Surfer.
This is a retelling of "The Coming of the Krills" by Stan Lee and Steve Ditko in Amazing Adult Fantasy (Marvel, 1961 series) #8 (January 1962) and of "Shock!" by Stan Lee and Larry Lieber in Tales of Suspense (Marvel, 1959 series) #47 (November 1963).