If memory serves, Ten Who Dared was one of the last Mobil Showcase productions, produced jointly by Time-Life's television arm and the BBC. The miniseries hasn't been replayed, save maybe for a run on A & E, since its initial syndicated run in 1978. Actor Anthony Quinn, whose only other series was the short-lived Man & the City for ABC a few years earlier, serves as host.
Another ABC connection is the theme music, lifted from Monday Night Football, and was also used by SFM Media for their Holiday/Family Theatre presentations. For the record, the song, heard briefly in the following excerpt, is called "Heavy Action".
Here, Quinn queues up the episode profiling Spanish explorer Francisco Pizarro.