With the four titles' debuts set to be staggered over the course of four months, Marvel premiered Journey into Mystery vol. 2 (Oct. 1972), Chamber of Chills (Nov. 1972), Supernatural Thrillers (Dec. 1972), and, with a late start, Worlds Unknown (May 1973). The first issue featured Frederik Pohl's "The Day after the Day the Martians Came", adapted by writer Gerry Conway and artist Ralph Reese, and "He that Hath Wings", adapted by writer-penciler Gil Kane from a 1934 Edmond Hamilton story published in the pulp magazine Popular Fiction. It also included a story from Marvel's 1950 predecessor, Atlas Comics: the three-page "Nightmare at Noon" with art by Angelo Torres, from Astonishing #54 (Oct. 1956).
Subsequent issues included such adaptations as L. Sprague deCamp's 1956 "A Gun for Dinosaur", by writer Thomas and penciler Val Mayerik (#2); Harry Bates' 1940 "Farewell to the Master", with Thomas and penciler Ross Andru adapting the source material of the film classic The Day the Earth Stood Still (#3); Fredric Brown's 1944 "Arena", with Conway and penciler John Buscema on a short story previously adapted for an episode of the TV series Star Trek (#4); A. E. van Vogt's first published SF story, "Black Destroyer" (1939), by Thomas and penciler Dan Adkins (#5); and Ted Sturgeon's 1944 "Killdozer", by Conway and penciler Dick Ayers (#6).
The final two issues changed direction and featured an adaptation of the contemporaneous film The Golden Voyage of Sinbad (1974), based on the screenplay by Brian Clemens and the story by Clemens and Ray Harryhausen. Titled The Golden Voyage of Sinbad: Land of the Lost, it was by writer Len Wein and penciler George Tuska.