Challengers of the Unknown (1958-1978)
Iss # Published Issue InfoImg
4 November, 1958 The Wizard of Time; Cover by Jack KirbyL
5 January, 1959 Cover by Jack KirbyL
6 March, 1959 Captives of the Space Circus; The Sorceress of the Forbidden Valley; Cover by Jack KirbyL
7 May, 1959 The Beasts From Planet 9; The Isle of No Return; Cover by Jack KirbyL
8 July, 1959 The Man Who Stole the Future; The Prisoners of the Robot Planet; Cover by Jack KirbyL
76 November, 1970 The Traitorous Challenger; Secret of the Sorceror's Mirror; Cover by Jack KirbyL
78 February, 1973 Isle of No Return; Cover by Jack KirbyL