SINGLE COMICS DC C Challengers of the Unknown Series 1 #64 PreviousChallengers of the Unknown Series 1 #63 NextChallengers of the Unknown Series 1 #65 Challengers of the Unknown Series 1 #64 Challengers of the Unknown Series 1 #64 £20.00 DC Nov 1968. 1st Print. Kanigher, Sparling. Cover: Joe Kubert. VFN 8.0. 36 pages complete Add To Cart Facebook0 Twitter