Doctor Who: The Invisible Enemy, Part 1
The 458th episode of Doctor Who airs on BBC1. Michael Sheard (The Empire Strikes Back) and Frederick Jaeger guest star.
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Space Academy: Countdown
The fourth episode of Filmation’s Saturday morning science fiction series Space Academy airs on CBS. A combatant from a mostly forgotten war is discovered, and he’s still in a mood to fight.
Wonder Woman: The Man Who Could Move The World
The 16th episode of Wonder Woman airs on CBS, starring Lynda Carter and Lyle Waggoner. Yuki Shimoda and Lew Ayres guest star. 
Logan’s Run: Capture
CBS airs the third episode of the TV adaptation of Logan’s Run. Mary Woronov guest stars.
Raven: Episode 2
ITV airs the second episode of Raven, starring Phil Daniels (Quadrophenia) and Shirley Cheriton (EastEnders).
Six Million Dollar Man: Deadly Countdown Part 1
The 82nd episode of The Six Million Dollar Man is broadcast on ABC, starring Lee Majors and Richard Anderson. Jenny Agutter (Logan’s Run) guest stars.
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The Bionic Woman: Fembots In Las Vegas Part 1
The 39th episode of The Bionic Woman, starring Lindsay Wagner and Richard Anderson, airs on NBC. James Olson (The Andromeda Strain) and Melinda Fee (The Invisible Man) guest star.
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Doctor Who: Horror Of Fang Rock, Part 4
The 457th episode of Doctor Who airs on BBC1. The Rutans, shapeshifting mortal enemies of the Sontarans, appear for the first and only time in the original series.
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Space Academy: Hide And Seek
The third episode of Filmation’s Saturday morning science fiction series Space Academy airs on CBS. Something is causing everyone at Space Academy to vanish, occasionally in mid-sentence.
Wonder Woman: Anschluss ’77
The 15th episode of Wonder Woman airs on CBS, starring Lynda Carter and Lyle Waggoner. Mel Ferrer guest stars.
Logan’s Run: The Collectors
CBS airs the second episode of the TV adaptation of Logan’s Run. Angela Cartwright guest stars.
Man From Atlantis: Melt Down
The first episode of the science fiction series Man From Atlantis airs on NBC, starring Patrick Duffy and Belinda J. Montgomery. Victor Buono (Batman) and Dee Wallace Stone (E.T.) guest star. This is the beginning of Man From Atlantis’ single season as a weekly hour-long TV series, following on from four TV movies that had already aired earlier in 1977.
Raven: Episode 1
The first episode of Raven premieres on British broadcaster ITV, starring Phil Daniels (Quadrophenia) and Shirley Cheriton (EastEnders). The series is created and written by Jeremy Burnham and Trevor Ray (Children Of The Stones).
Six Million Dollar Man: Sharks Part 2
The 81st episode of The Six Million Dollar Man is broadcast on ABC, starring Lee Majors and Richard Anderson. Pamela Hensley (Buck Rogers In The 25th Century) guest stars.
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The Bionic Woman: The Bionic Dog Part 2
The 38th episode of The Bionic Woman, starring Lindsay Wagner and Richard Anderson, airs on NBC. Dale Robinette (The Doctors) guest stars.
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Doctor Who: Horror Of Fang Rock, Part 3
The 456th episode of Doctor Who airs on BBC1. The Rutans, shapeshifting mortal enemies of the Sontarans, appear for the first and only time in the original series.
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Space Academy: Castaways In Time & Space
The second episode of Filmation’s Saturday morning science fiction series Space Academy airs on CBS. The still-cutting-edge Fairchild Video Entertainment System “guest stars” as the Academy’s computer, beating Peepo at Tic-Tac-Toe.
The Return Of Wonder Woman
The 14th episode of Wonder Woman airs on CBS, starring Lynda Carter and Lyle Waggoner. This episode, guest starring Fritz Weaver, opens the show’s second season, and advances the story into the present day (the late 1970s), eliminating the expenses of props, costumes and cars associated with wartime America.
Logan’s Run series premieres
With a writing staff populated heavily with veterans of the quickly-cancelled The Fantastic Journey, CBS launches Logan’s Run as a television series, with the extended-length pilot episode roaring through the events of the 1976 movie in mere minutes! After only a few episodes, however, CBS schedules the lightweight sci-fi series against Monday Night Football, sealing its doom.
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Spider-Man comes to television
The superhero TV movie-of-the-week Spider-Man airs on CBS, starring Nicholas Hammond (The Sound Of Music) and David White (Bewitched). Based on the Marvel comic of the same name, Spider-Man tells the origin story of Peter Parker, a young man who gains superpowers after being bitten by a radioactive spider. Heavily promoted at the height of the character’s comics popularity, the movie does well in the ratings, but due to its effects budget, CBS is only willing to approve a short run of hour-long episodes for the following year.
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Six Million Dollar Man: Sharks Part 1
The 80th episode of The Six Million Dollar Man is broadcast on ABC, starring Lee Majors and Richard Anderson. Pamela Hensley (Buck Rogers In The 25th Century) guest stars in the fifth season premiere.
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Space Academy premieres
CBS premieres a new live-action Saturday morning science fiction series, Space Academy, produced by Filmation (previously responsible for the animated Star Trek series). Depicting a crew of teenagers tasked with maintaining the safety of outer space, Space Academy is in the right place at the right time to capitalize on Star Wars mania.
The Bionic Woman: The Bionic Dog Part 1
The 37th episode of The Bionic Woman, starring Lindsay Wagner and Richard Anderson, airs on NBC. This is the first episode of season three, and the first episode to air on NBC, which salvaged the series from its cancellation by ABC. This puts Anderson in a position that may be unique in American broadcast history: playing the same character as a series regular on two rival networks simultaneously.
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Doctor Who: Horror Of Fang Rock, Part 2
The 455th episode of Doctor Who airs on BBC1. The Rutans, shapeshifting mortal enemies of the Sontarans, appear for the first and only time in the original series.
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Doctor Who: Horror Of Fang Rock, Part 1
The 454th episode of Doctor Who airs on BBC1. The Rutans, shapeshifting mortal enemies of the Sontarans, appear for the first and only time in the original series. Doctor Who’s 15th season on the air begins with this episode.
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Quinn Martin’s Tales Of The Unexpected: No Way Out
NBC airs the eighth and final episode of Quinn Martin’s horror/sci-fi anthology Tales Of The Unexpected. (This series is not to be confused with the longer-lived British series of the same name, created by acclaimed author Roald Dahl.) Bill Bixby (The Magician, The Incredible Hulk) and Robert Pine (CHiPs) guest star. (The series has already been cancelled at this point; NBC is burning off the remaining episodes into off-season time slots.)
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Quinn Martin’s Tales Of The Unexpected: You’re Not Alone
NBC airs the seventh episode of Quinn Martin’s horror/sci-fi anthology Tales Of The Unexpected. (This series is not to be confused with the longer-lived British series of the same name, created by acclaimed author Roald Dahl.) Joanna Pettet and Gary Collins (The Sixth Sense) guest star. (The series has already been cancelled at this point; NBC is burning off the remaining episodes into off-season time slots.)
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Exit Star Trek v2.0, enter The Motion Picture
At a meeting at Paramount, studio head Michael Eisner formally cancels plans for a Star Trek television series reuniting the original cast (a decision made easier by the other networks strong-arming potential advertisers into freezing out Paramount’s network startup attempt) and sets the wheels in motion to revamp the pilot script, Alan Dean Foster’s In Thy Image, into a feature film. Contracts for the series are renegotiated (or in some cases cancelled) for the movie, but scriptwriters and designers continue to work on Trek TV scripts just in case the movie leads to a small-screen resurgence. The impetus for finally getting the long-stalled Star Trek movie underway? 20th Century Fox’s runaway success with Star Wars.
Man From Atlantis IV: The Disappearances
The science fiction TV movie-of-the-week Man From Atlantis IV: The Disappearances airs on NBC, starring Patrick Duffy and Belinda J. Montgomery. Ernie Hudson (Ghostbusters) guest stars. Man From Atlantis will continue as a weekly series in the fall 1977 season.
Science Report: Alternative 3
UK broadcaster Anglia TV (later part of ITV) premieres the TV movie Science Report: Alternative 3, a “mockumentary” positing a scenario about Earth’s best and brightest young minds leaving their doomed world to start a colony on Mars. Originally intended to air on April 1st, 1977, the special – which is presented as an episode of a non-existent “Science Report” series – has been delayed due to broadcast industry strikes, but despite the end credits still carrying the April 1st date, the joke is lost on members of the viewing public, who call Anglia demanding further information; the “Alternative 3” scenario will gain traction as an actual conspiracy theory in the years to come, particularly when its 1978 novelization replaces the TV movie’s fictional astronauts with the names of real astronauts.