Challengers of the Unknown (1958-1978)
Iss # Published Issue InfoImg
44 July, 1965 Curse of the Evil Eye; Ace - the Challenger Who Went Bad; Cover by Bob BrownL
46 November, 1965 Strange Schemes of the Gargoyle; The Best Challenger Wins; Cover by Bob BrownL
47 January, 1966 The Sinister Sponge; The Terrors of Mr. Tic-Tac-Toe; Cover by Bob BrownL
49 May, 1966 The Tyrant Who Owned the World; Cover by Bob BrownL
51 September, 1966 Smash the Sponge Man -- or Die; Cover by Bob BrownL