Mystery in Space (1951-) #71

“THE CHALLENGE OF THE CRYSTAL CONQUERORS!” Adam Strange arrives on Rann to find it overtaken by crystal-like beings called the Karalyx. Unfortunately for the inhabitants of Rann, their weapons appear to be useless against these crystal beings! Plus, “THE LAST SPACE-FEUD.”

Written By:
Gardner Fox
Pencils:
Carmine Infantino, Sid Greene
Inks:
Joe Giella, Sid Greene
Cover By:
Carmine Infantino, Murphy Anderson