The 431st episode of Doctor Who airs on BBC1. Gareth Armstrong and Tim Piggott-Smith guest star.
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CBS airs the third episode of Filmation’s live-action Saturday morning science fiction series Ark II. 
ABC premieres the first episode of the sci-fi police comedy Holmes & Yoyo, starring Richard B. Shull and John Schuck (Star Trek IV: The Voyage Home, Babylon 5). The series centers around an accident-prone police detective who takes on a robotic partner in human guise. Larry Hovis (Hogan’s Heroes) guest stars.
The 59th episode of The Six Million Dollar Man is broadcast on ABC, starring Lee Majors and Richard Anderson. Farrah Fawcett Majors and Donald Moffat (Logan’s Run) guest star.
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The 16th episode of The Bionic Woman, starring Lindsay Wagner and Richard Anderson, airs on ABC. Martin E. Brooks (The Six Million Dollar Man) and Norman Fell (Three’s Company, The Ropers) guest star.
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The fifth episode of the British-German science fiction series Star Maidens premieres on ITV in the UK. Terence Alexander guest stars. (Not all regional ITV affiliates carry the show at a specific time; this episode guide reflects the dates for the broadcast premieres of each episode on Scottish TV.)
On or around this date in 1976, the very first teaser trailers for an upcoming 20th Century Fox movie called Star Wars is shown in theaters for the first time, with the ominous voice of Malachi Throne (who had, coincidentally, appeared or done voice-overs numerous times in classic Star Trek) declaring that “somewhere in space, this may all be happening right now.” With no hint of the genre-defining soundtrack music, unfinished visual effects, stand-in stock sound effects, and a logo rendered in Helvetica, the effect is perhaps a bit underwhelming.
NBC airs the second episode of Gemini Man, starring Ben Murphy, Katherine Crawford, and William Sylvester (2001: a space odyssey). Ross Martin (The Wild Wild West) guest stars.