"Plymouth" was a 1991 pilot for a series that was not picked up. I consider this TV movie to be part of Earth Prime-Time, serving as a kind of prequel to the first episode of 'Space; 1999'. (As you should know if you are a regular visitor here, after the explosion of the nuclear waste dump near Moonbase Alpha, everything else seen in the series were figments of Commander John Koenig's coma dream. Plymouth was an outlying colony under the aegis of Moonbase Alpha but run by the UNIDAC Corporation. Anything else, you'll learn watching this unsold pilot.
Each episode might lead right into the next, but just in case I've added all the YouTube links in the correct order.