Yep, that's the theme song. Dang, so ancient. Ha ha. Johnny Cash singing right?
Btw, at end of song the voice saying "This has been a Mark Godsen Bill Toddman production" certainly rings a lot of bells. Can't name all the specific shows, but it was very common hearing those names at the end of some shows.
Just like (and it just came to my head), remember after "The Fugitive", a voice would always say, "This has been a Quinn Martin Production." Don't know why I remember it, but I do. Ha ha
Commonplace back in the olden days.
TIS