Challengers of the Unknown (1958–1978)
87 issues · April-May 1958 - December 1970-January 1971
Issues
- #1· April-May 1958
- #2· June-July 1958
- #3· August-September 1958
- #4· October-November 1958
- #5· December 1958-January 1959
- #6· February-March 1959
- #7· April-May 1959
- #8· June-July 1959
- #9· August-September 1959
- #10· October-November 1959
- #11· December 1959-January 1960
- #12· February-March 1960
- #13· April-May 1960
- #14· June-July 1960
- #15· August-September 1960
- #16· October-November 1960
- #17· December 1960-January 1961
- #18· February-March 1961
- #19· April-May 1961
- #20· June-July 1961
- #21· August-September 1961
- #22· October-November 1961
- #23· December 1961-January 1962
- #24· February-March 1962
- #25· April-May 1962
- #26· June-July 1962
- #27· August-September 1962
- #28· October-November 1962
- #29· December 1962-January 1963
- #30· February-March 1963
- #31· April-May 1963
- #32· June-July 1963
- #33· August-September 1963
- #34· October-November 1963
- #35· December 1963-January 1964
- #36· February-March 1964
- #37· April-May 1964
- #38· June-July 1964
- #39· August-September 1964
- #40· October-November 1964
- #41· December 1964-January 1965
- #42· February-March 1965
- #43· April-May 1965
- #44· June-July 1965
- #45· August-September 1965
- #46· October-November 1965
- #47· December 1965-January 1966
- #48· February-March 1966
- #49· April-May 1966
- #50· June-July 1966
- #51· August-September 1966
- #52· October-November 1966
- #53· December 1966-January 1967
- #54· February-March 1967
- #55· April-May 1967
- #56· June-July 1967
- #57· August-September 1967
- #58· October-November 1967
- #59· December 1967-January 1968
- #60· February-March 1968
- #61· April-May 1968
- #62· June-July 1968
- #63· August-September 1968
- #64· October-November 1968
- #65· December 1968-January 1969
- #66· February-March 1969
- #67· April-May 1969
- #68· June-July 1969
- #69· August-September 1969
- #70· October-November 1969
- #71· December 1969-January 1970
- #72· February-March 1970
- #73· April-May 1970
- #74· June-July 1970
- #75· August-September 1970
- #76· October-November 1970
- #77· December 1970-January 1971
- #78· February 1973
- #79· March-April 1973
- #80· June-July 1973
- #81· June-July 1977
- #82· August-September 1977
- #83· October-November 1977
- #84· December 1977-January 1978
- #85· February-March 1978
- #86· April-May 1978
- #87· June-July 1978