The Marvel Super-Heroes title began with a giant-sized one-shot in October 1966, reprinting Daredevil #1 (April 1964) and The Avengers #2 (Nov. 1963), plus two stories from the Golden Age: "The Human Torch and the Sub-Mariner Meet" (from Marvel Mystery Comics #8, June 1940), and the first Marvel story by future editor-in-chief Stan Lee, the two-page text piece "Captain America Foils the Traitor's Revenge" (Captain America Comics #3, May 1941).
The title then actually began again in 1967 with issue #12, the first 11 issues having appeared under the title Fantasy Masterpieces. Marvel Super-Heroes began showcasing a try-out feature as each issue's lead. This encompassed solo stories of such supporting characters as Medusa of the Inhumans, as well as the debuts of Captain Marvel (#12), the first appearance of Carol Danvers (later Ms. Marvel) (#13), the Phantom Eagle (#16), and the Guardians of the Galaxy (#18).
Marvel Super-Heroes became an all-reprint magazine beginning with #21 (July 1969), and a regular-sized comic at the then-standard 20-cent price with #32 (Sept. 1972). That issue actually began the long-running practice of reprinting the stories of the Hulk and Sub-Mariner from Tales To Astonish in the previous decade. The reprints lasted through the end of the book's run with issue #105 (Jan. 1982).
A second series titled Fantasy Masterpieces ran from #1-14 (Dec. 1979 - Jan. 1981), reprinting truncated versions of the 1968 Silver Surfer series, as well as Adam Warlock back-up stories from Strange Tales and [The Power of] Warlock.