This is AlternateHistory.com's last day of August, so here it is.
The Paramount Television Service (or PTVS for short and also known as Paramount Programming Service) was the name of a proposed but ultimately unrealized "fourth television network" from the U.S. film studio Paramount Pictures (then a unit of Gulf+Western). It was a forerunner of the later UPN (the United Paramount Network), which launched 17 years later.
In the October of 1977, Paramount signed an agreement with the RKO independent station group (WOR-TV, KHJ-TV) the Chris-Craft station KPTV, the Field Communications station group (WFLD, WKBS, KBHK, WLVI and WKBD) and WUAB-TV to clear the network.
Paramount asked RKO to doubled the nights a week up to two, adding a Sunday night programming block. Its first programs launched was Star Trek Phase II and a series derived from The War of The Worlds (produced by George Pal) and 30 Movie of the Week programs followed Star Trek Phase II followed it on Saturday nights.
Ultimately, the network failed in 1983 due to heavy competition from the Big Three networks (CBS, ABC and NBC) and a controversial lawsuit/dispute between Paramount and RKO General. Barry Diller later go on to do Fox Broadcasting Company three years later and Paramount went on to a joint venture with Chris-Craft to do UPN 12 years later.