Justice League of America (1960-) #91

On Earth-2, the JSA face off against the alien A-Rym, while on Earth-1, the JLA must take on A-Rym's symbiotic pet!

Written By:
Gardner Fox, Bob Kanigher, Mike Friedrich
Pencils:
Carmine Infantino, Dick Dillin
Inks:
Joe Giella, Sid Greene
Cover By:
Neal Adams