The Day Of The Triffids: Episode 1
The first episode of BBC1’s adaptation of The Day Of The Triffids premieres, based on John Wyndham’s novel. W. Morgan Sheppard (Max Headroom) guest stars. 
Come Back, Mrs. Noah: Last Chance
The sixth and final episode of the science fiction sitcom Come Back, Mrs. Noah, created by the writing duo behind the perennial favorite Are You Being Served? and starring Mollie Sugden, is aired by the BBC.
Come Back, Mrs. Noah: Housing Problem
The fifth episode of the science fiction sitcom Come Back, Mrs. Noah, created by the writing duo behind the perennial favorite Are You Being Served? and starring Mollie Sugden, is aired by the BBC.
Come Back, Mrs. Noah: Who Goes Home
The fourth episode of the science fiction sitcom Come Back, Mrs. Noah, created by the writing duo behind the perennial favorite Are You Being Served? and starring Mollie Sugden, is aired by the BBC.
Come Back, Mrs. Noah: To The Rescue
The third episode of the science fiction sitcom Come Back, Mrs. Noah, created by the writing duo behind the perennial favorite Are You Being Served? and starring Mollie Sugden, is aired by the BBC.
Come Back, Mrs. Noah: In Orbit
The second episode of the science fiction sitcom Come Back, Mrs. Noah, created by the writing duo behind the perennial favorite Are You Being Served? and starring Mollie Sugden, is aired by the BBC.
Come Back, Mrs. Noah
The pilot episode of the science fiction sitcom Come Back, Mrs. Noah, created by the writing duo behind the perennial favorite Are You Being Served? and starring Mollie Sugden, is aired by the BBC. The remaining five episodes are to be aired in 1978. Hear about it on the Sci-Fi 5 podcast
The Changes: The Cavern
The tenth and final episode of The Changes airs on BBC1, adapting the novels of Peter Dickinson into a ten-part television serial starring Vicky Williams and Keith Ashton. Oscar Quitak (Brazil) guest stars. The series was filmed in 1973, but has been held for broadcast until 1975; an entire generation of young viewers will go on to consider the short series a seminal event in UK genre TV.
The Changes: The Quarry
The ninth episode of The Changes airs on BBC1, adapting the novels of Peter Dickinson into a ten-part television serial starring Vicky Williams and Keith Ashton. Tom Chadbon (Doctor Who, Blake’s 7) and Oscar Quitak (Brazil) guest star. The series was filmed in 1973, but has been held for broadcast until 1975.
The Changes: Lightning!
The eighth episode of The Changes airs on BBC1, adapting the novels of Peter Dickinson into a ten-part television serial starring Vicky Williams and Keith Ashton. Tom Chadbon (Doctor Who, Blake’s 7) guest stars. The series was filmed in 1973, but has been held for broadcast until 1975.
The Changes: Heartsease
The seventh episode of The Changes airs on BBC1, adapting the novels of Peter Dickinson into a ten-part television serial starring Vicky Williams and Keith Ashton. The series was filmed in 1973, but has been held for broadcast until 1975.
The Changes: A Pile Of Stones
The sixth episode of The Changes airs on BBC1, adapting the novels of Peter Dickinson into a ten-part television serial starring Vicky Williams and Keith Ashton. The series was filmed in 1973, but has been held for broadcast until 1975.
The Changes: Witchcraft!
The fifth episode of The Changes airs on BBC1, adapting the novels of Peter Dickinson into a ten-part television serial starring Vicky Williams and Marc Zuber. The series was filmed in 1973, but has been held for broadcast until 1975.
The Changes: Hostages!
The fourth episode of The Changes airs on BBC1, adapting the novels of Peter Dickinson into a ten-part television serial starring Vicky Williams and Marc Zuber. The series was filmed in 1973, but has been held for broadcast until 1975.
The Changes: The Devil’s Children
The third episode of The Changes airs on BBC1, adapting the novels of Peter Dickinson into a ten-part television serial starring Vicky Williams and Marc Zuber. The series was filmed in 1973, but has been held for broadcast until 1975.
The Changes: The Bad Wires
The second episode of The Changes airs on BBC1, adapting the novels of Peter Dickinson into a ten-part television serial starring Vicky Williams and Marc Zuber. The series was filmed in 1973, but has been held for broadcast until 1975.
The Changes: The Noise
The first episode of The Changes airs on BBC1, adapting the novels of Peter Dickinson into a ten-part television serial starring Vicky Williams and Bernard Horsfall. The series was filmed in 1973, but has been held for broadcast until 1975. Hear about it on the Sci-Fi 5 podcast
Moonbase 3: View Of A Dead Planet
The final episode of the BBC’s short-lived science fiction series Moonbase 3 premieres. Michael Gough (Batman) guest stars. Hear about it on the Sci-Fi 5 podcast
Moonbase 3: Castor And Pollux
The fifth episode of the BBC’s short-lived science fiction series Moonbase 3 premieres. George Pravda guest stars.
Moonbase 3: Outsiders
The fourth episode of the BBC’s short-lived science fiction series Moonbase 3 premieres. Garrick Hagon (Star Wars) guest stars.
The Moonbase 3: Behemoth
The second episode of the BBC’s short-lived science fiction series Moonbase 3 premieres. Peter Miles guest stars.
Moonbase 3: Departure And Arrival
The first episode of the BBC’s short-lived science fiction series Moonbase 3, premieres. Written by series creators Barry Letts and Terrance Dicks, and produced during their downtime as producer and script editor of Doctor Who, Moonbase 3 is an attempt to do “serious” SF without fanciful elements such as aliens.
Doomwatch: Killer Dolphins
BBC1 airs the 37th episode of Doomwatch. This episode no longer exists in the BBC’s archives. Due to its controversial content, the following episode, Sex And Violence, is never broadcast by the BBC, and production on the series is shut down before the planned 13th and final episode of the season can be filmed, effectively making Killer Doplhins the series’ broadcast swan song.
Doomwatch: Cause Of Death
BBC1 airs the 35th episode of Doomwatch. This episode, guest starring Nicholas Courtney (who is, at this time, still appearing in Doctor Who as Brigadier Lethbridge-Stewart), no longer exists in the BBC’s archives.
Doomwatch: Flood
BBC1 airs the 35th episode of Doomwatch. This episode no longer exists in the BBC’s archives.
Doomwatch: Enquiry
BBC1 airs the 34th episode of Doomwatch. This episode, guest starring Michael Keating (Blake’s 7), no longer exists in the BBC’s archives.
Doomwatch: Deadly Dangerous Tomorrow
BBC1 airs the 33rd episode of Doomwatch. This episode, guest starring Madhav Sharma (Moonbase 3) and Marc Zuber (The Changes) no longer exists in the BBC’s archives.
Doomwatch: Without The Bomb
BBC1 airs the 31st episode of Doomwatch. This episode no longer exists in the BBC’s archives.
Doomwatch: Say Knife, Fat Man
BBC1 airs the 29th episode of Doomwatch. This episode, guest starring Elisabeth Sladen (Doctor Who, The Sarah Jane Adventures) no longer exists in the BBC’s archives.