The final episode of 12 O'Clock High, "The Hunters and the Killers" (Jan. 13, 1967) gives us one last Trek guest:
And as we're now at the end, here's one last shout-out to our usually unheralded full-series regular:
Overton passed away only months after this aired. His Wiki page claims that "This Side of Paradise" was his last role, which may or may not have been the case production-wise, but IMDb lists appearances on The Virginian and Bonanza that aired later...the latter, the day before he died.

And as we're now at the end, here's one last shout-out to our usually unheralded full-series regular:

Overton passed away only months after this aired. His Wiki page claims that "This Side of Paradise" was his last role, which may or may not have been the case production-wise, but IMDb lists appearances on The Virginian and Bonanza that aired later...the latter, the day before he died.