Entertainment Alternate History

[True Federalist (진정한 연방 주의자)]

1968 - NBC decides to take a gamble sticks with its original decision to air the third season at 7:30pm on Mondays instead of moving it to 10pm Fridays.  Laugh-In producer George Schaltter makes good on his threat to take his show to another network if he doesn't retain the 8pm time slot.  Laugh-In reappears on ABC in January 1969 where it continues to be a success, but Nixon never gets to say "Sock it to me?"

After five seasons, NBC decides that Star Trek needs considerable refreshing, plus Shatner and Nimoy are making expensive contract demands.  Thus for the sixth season Kirk, Spock, and the Enterprise are gone.  Instead, the show is based on space station K-9 on the border of the Organian Treaty Zone with the Klingons, with Doctor McCoy and Lieutenant Chekov transferring over.  McLean Stephenson takes command as Commodore Blackwell.  Yeoman Janice Rand from the first season comes back as an Ensign (explained in continuity by her having been at Starfleet Academy during season 2 to 5).  But the rest of the cast are new characters, including a not entirely honest Klingon merchant/spy.  After the eighth season, the show is finally canceled due to low ratings.  No movies or followup series are ever made.

One other effect was that K-9 on Doctor Who ended up being named FIDO instead.

[True Federalist (진정한 연방 주의자)]

No way CBS would have allowed Still in Saigon to run in 1968.    Maybe Still in Salerno set during the invasion of Sicily, but not Still in Saigon.  The absolute rule of 1960's Sci-Fi TV is that commentary on current events not allowed other TV programs was allowed, but only under the guise of allegory to a historical or future setting.