Below are two excerpts from Irwin Allen's City Beneath the Sea pilot for a TV series from 1969.
Glenn Corbett stars as the commander of Triton Tower, General Matthews, with James Brolin as Tyler, Lawrence Montaigne as an amphibian (and Mr. Spock clone), Doctor Aguila, and Lloyd Bochner as Temple, the villain. Also in the cast was Cecile Ozorio as the security chief, and Francine York.
The second video repeats the last 4 minutes of the first video, then gives the final four minutes, where Matthews dispatches Temple.
As an aside, Glenn Corbett is about the stiffest actor I've seen
This video is the complete version - all 9 minutes of it! with the very ending and credits that the video above lacks. However, I think the two vids above are of slightly better quality.