From Beyond The Unknown, Issue #4 (DC Comics, May 1970).

"Riddle of the Vanishing Earthmen" reprinted from Mystery in Space #32

Writer, Gardner Fox / Penciler, Sid Greene / Inker, Joe Giella

"Our Home is in the Stars" reprinted from Mystery in Space #65

Writer, Gardner Fox / Penciler, Carmine Infantino / Inker, Bernard Sachs

"The Surprise Package Planet" reprinted from Mystery in Space #47

Writer, Gardner Fox / Penciler, Murphy Anderson / Inker, Murphy Anderson