The HMSS Blog has a terrific piece on the saga of Call to Danger, a series concept that CBS kept trying to make work during the 60s and 70s. The idea was that a spy would recruit an ordinary citizen to help him solve a crime. I also wrote in detail about these pilots in my book, Unsold Television Pilots.
The network commissioned three pilots — in 1961, 1967 and 1973 — but none of them clicked.
Lloyd Nolan starred as treasury agent Robert Hale in the 1961 pilot, which was produced by Perry Lafferty, who later became a top CBS exec.
In the 1968 pilot, Peter Graves played Jim Kingsley, an agent for the Office of National Resources, who used a super computer to recruit citizens to help out…to a rousing Morton Stevens' theme. James Gregory played his boss. The network liked Graves so much, they made him the star of Mission Impossible. And they liked Stevens' Call to Danger theme so much that they re-used it in the score to the Hawaii Five-O pilot and as the "CBS Specials" theme.
In the 1973 pilot, written by MI producer Laurence Heath, Graves reluctantly signed on again. this time playing Treasury Agent Douglas Warfield, who also uses computers to recruit civilians to help him solve crimes…but with a different theme tune.
Here's the opening to the 1973 pilot