The 20th episode of Glen A. Larson’s science fiction series Battlestar Galactica airs on ABC. 
The ninth episode of the series Salvage 1 airs on ABC, starring Andy Griffith, Joel Higgins, and Trish Stewart. Richard Jaeckel (Spenser For Hire) and Moses Gunn (Shaft, Father Murphy) guest star.
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BBC1 premieres the 26th episode of Terry Nation’s science fiction series Blake’s 7. This season-ending episode concludes the story arc concerning Blake’s search for the Federation’s central control facility, and sees the exit of some of the show’s regulars, inclduing Jenna Knyvette (Jenna), Brian Croucher (Travis) and even Gareth Thomas (Blake).
The 31st episode of the live-action series based on Marvel’s comic The Incredible Hulk airs on CBS, starring Bill Bixby, Jack Colvin, and Lou Ferrigno. Kim Cattrall and Whit Bissell guest star.
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ITV airs the third episode of Roald Dahl’s anthology series Tales Of The Unexpected, hosted by the author himself and adapted from his short stories. This story had previously been adapted for Dahl’s 1961 American anthology series, ‘Way Out.
The sixth episode of Supertrain airs on NBC, starring Edward Andrews and Patrick Collins. Joyce DeWitt (Three’s Company), Jamie Farr (M*A*S*H), Isobel Sanford (The Jeffersons), Bernie Kopell (The Love Boat), Vic Tayback (Alice), and Tony Danza (Who’s The Boss?) guest star.
The Soviet Union launches Soyuz 33, intended to take cosmonauts Nikolai Rukavishnikov and Georgi Ivanov (the latter of whom is the first Bulgarian space traveler) to space station Salyut 6. But Soyuz 33 never reaches its destination. At a distance of 3,000 feet from Salyut, Soyuz 33’s main engine fails to fire – the first time such a failure has ever occurred in over a decade of Soyuz flights. Soyuz 33 is recalled to Earth at the earliest opportunity, leaving the station crew with no visits from any other human beings during their two-man, 175-day stay in orbit. It is later discovered that Soyuz 33’s engine could have exploded, causing critical damage to the entire vehicle – and ground controllers now focus their attention on Soyuz 32, docked at Salyut with an engine of identical design which could also fail.
ITV airs the fourth episode of Roald Dahl’s anthology series Tales Of The Unexpected, hosted by the author himself and adapted from his short stories. Susan George and Brian Blessed guest star.
The seventh episode of Supertrain airs on NBC, starring Edward Andrews and new cast member Joey Aresco. Zsa Zsa Gabor, Lyle Waggoner (Wonder Woman), Peter Lawford (The Thin Man, Ocean’s 11), Abe Vigoda (Barney Miller), and Sally Kirkland guest star.
Random House publishes the Star Wars Question And Answer Book About Space, written by Dr. Dinah Moche. Cashing in on young Star Wars fans’ sudden fascination with space, the book explores many astronomical phenomena, and past, current and future spaceflight (as of 1979) and space science topics, framed within the context of the Star Wars universe.
MCA Records releases Stu Phillips‘ soundtrack from the movie Buck Rogers In The 25th Century. (The movie, as well as its music, will also serve as the first episode of the television series of the same name later in the year.)
The tenth episode of the series Salvage 1 airs on ABC, starring Andy Griffith, Joel Higgins, and Trish Stewart. Richard Jaeckel (Spenser For Hire) and Ed Nelson (Peyton Place) guest star.
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ITV airs the fifth episode of Roald Dahl’s anthology series Tales Of The Unexpected, hosted by the author himself and adapted from his short stories. Siobhan McKenna guest stars.
Casablanca Records releases Lenny & Squiggy present Lenny and the Squigtones, an album combining spoken-word comedy and ’50s rock pastiches performed by Michael McKean and David Lander in their characters best known to the general public from recurring appearances on Laverne & Shirley.
The first episode of Time Express premieres on CBS, starring Vincent Price and Coral Browne. Jerry Stiller, Anne Meara, Gay Rowan (The Starlost), and John de Lancie (Star Trek: The Next Generation) guest star. 
ITV airs the sixth episode of Roald Dahl’s anthology series Tales Of The Unexpected, hosted by the author himself and adapted from his short stories. Joan Collins and John Gielgud guest star.
The eighth episode of Supertrain airs on NBC, starring Edward Andrews and Joey Aresco. Clyde Kusatsu, Cleavon Little, and Roddy McDowall (Planet Of The Apes, Fantastic Journey) guest star.
The 21st episode of Glen A. Larson’s science fiction series Battlestar Galactica airs on ABC. This is the end of the first season, and the last episode to feature the original characters; when Battlestar Galactica returns nearly a year later, it reflects dramatic budgetary and creative restrictions imposed upon Larson by ABC.
Magnavox releases the video game cartridge Take The Money And Run! for the Odyssey² video game system, designed and programmed by Ed and Linda Averett. This is a two-player maze game that predates Pac-Man.