Quark
NBC airs the pilot of Quark, a new series from Get Smart creator Buck Henry which marks an unlikely combination of science fiction and sitcom. The pilot broadcast gets enough attention to merit a series pickup, but within weeks, Henry’s writing staff is presented with a much meatier target for satire than Star Trek, which Quark originally sets out to parody. 
Hear about it on the Sci-Fi 5 podcast
Man From Atlantis II: The Death Scouts
The science fiction TV movie-of-the-week Man From Atlantis II: The Death Scouts airs on NBC, starring Patrick Duffy and Belinda J. Montgomery.
Fantastic Journey: Riddles
The ninth episode of the short-lived NBC series The Fantastic Journey premieres. The promise of shelter for the night turns into a waking nightmare (not to mention an episode that would’ve been ideal for a Halloween special).
Fantastic Journey: Turnabout
The eighth episode of the short-lived NBC series The Fantastic Journey premieres. The travelers stumble into a deadly escalation of a war between the sexes. Joan Collins guest stars.
Fantastic Journey: Funhouse
The seventh episode of the short-lived NBC series The Fantastic Journey premieres. The travelers visit an unusual circus from which there is no escape.
Fantastic Journey: An Act Of Love
The sixth episode of the short-lived NBC series The Fantastic Journey premieres. Varian hangs up his traveling shoes to get married; his bride, naturally, doesn’t survive to the end of the episode.
Fantastic Journey: A Dream Of Conquest
The fifth episode of the short-lived NBC series The Fantastic Journey premieres. John Saxon guest stars, and a model of the space shuttle with its external tank and solid rocket boosters is referred to as a spaceship from the distant future.
Man From Atlantis
The science fiction TV movie-of-the-week Man From Atlantis airs on NBC, starring Patrick Duffy and Belinda J. Montgomery. Created by Mayo Simon and classic Star Trek veteran Herbert F. Solow, Man From Atlantis centers around a mysterious man from the ocean (Duffy) discovered by humans, who find he is willing to live among them and coexist for peaceful purposes. Three more TV movies will follow, each successful enough for NBC to greenlight a weekly series in the 1977-78 season. Hear about it on the Sci-Fi 5 podcast
Fantastic Journey: Children Of The Gods
The fourth episode of the short-lived NBC series The Fantastic Journey premieres. The travelers find a futuristic city where orphaned children have taken over and gone mad with their newfound power.
Fantastic Journey: Beyond The Mountain
The third episode of the short-lived NBC series The Fantastic Journey premieres. Roddy McDowall joins the cast as an amoral scientist, adding some star power (and a bunch of androids) to the show’s lineup.
The Fantastic Journey: Atlantium
The second episode of the short-lived NBC series The Fantastic Journey premieres. Katie Saylor joins the cast as Liana, a character not included in the original series outline who helps the few holdovers from the pilot episode.
The Fantastic Journey: Vortex
NBC premieres The Fantastic Journey, a “sci-fi-lite” series featuring such Star Trek veterans as story editor D.C. Fontana and director Vincent McEveety, but dealing mainly with familiar concepts (the lost city of Atlantis, post-apocalyptic futures that look a lot like southern California, etc.). It lasts only ten episodes before it’s cancelled. Hear about it on the Sci-Fi 5 podcast
Gemini Man: Sam Casey, Sam Casey
NBC airs the third episode of Gemini Man, starring Ben Murphy, Katherine Crawford, and William Sylvester (2001: a space odyssey). Nancy Malone (Naked City, Capricorn One) guest stars.
Gemini Man: The Minotaur
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.
Gemini Man: Smithereens
NBC airs the first episode of Gemini Man, starring Ben Murphy and Katherine Crawford; William Sylvester takes over Richard Dysart’s role from the pilot movie, and Andrew Prine and country music artist Jim Stafford guest star. This episode becomes infamous for a later appearance on Mystery Science Theater 3000.
Gemini Man: Pilot
NBC premieres the pilot movie Gemini Man, a retooling of the concept of The Invisible Man series the network cancelled earlier in the year. The movie stars Ben Murphy, Katherine Crawford, and Richard Dysart (L.A. Law). A very brief series will premiere as part of NBC’s fall season.
Search: Moment Of Madness
NBC airs the 20th episode of Leslie Steven’s “spy-fi” series Search, starring Doug McClure and Burgess Meredith. Patrick O’Neal guest stars.
Ghost Story: Creatures Of The Canyon
NBC airs the 13th episode of the supernatural anthology series Ghost Story, produced by 1960s horror movie mogul William Castle and starring Sebastian Cabot. Angie Dickinson and Madlyn Rhue guest star.
Search: The Adonis File
The ninth episode of Leslie Steven’s “spy-fi” series Search airs on NBC, starring Hugh O’Brian and Burgess Meredith. Bill Bixby (The Incredible Hulk) and Deanna Lund (Land Of The Giants) guest star.
Search: In Search Of Midas
The eighth episode of Leslie Steven’s “spy-fi” series Search airs on NBC, starring Doug McClure and Burgess Meredith. Barbara Feldon (Get Smart) guest stars.
Search: The Bullet
The seventh episode of Leslie Steven’s “spy-fi” series Search airs on NBC, starring Hugh O’Brian and Burgess Meredith. Malachi Throne and Ina Balin guest star.
Search: Operation Iceman
The sixth episode of Leslie Steven’s “spy-fi” series Search airs on NBC, starring Tony Franciosa and Burgess Meredith. Edward Mulhare (Knight Rider) guest stars.
Search: Live Men Tell Tales
The fifth episode of Leslie Steven’s “spy-fi” series Search airs on NBC, starring Tony Franciosa and Burgess Meredith. Louise Sorel guest stars.
Search: Moonrock
The fourth episode of Leslie Steven’s “spy-fi” series Search airs on NBC, starring Hugh O’Brian and Burgess Meredith. Jo Ann Pflug guest stars.
Search: Short Circuit
The third episode of Leslie Steven’s “spy-fi” series Search airs on NBC, starring Doug McClure and Burgess Meredith. Jeff Corey guest stars.
Ghost Story: The Concrete Captain
NBC airs the third episode of the supernatural anthology series Ghost Story, produced by 1960s horror movie mogul William Castle and starring Sebastian Cabot. Gena Rowlands guest stars in a script based on a short story by Elizabeth Walter, and directed by future Superman movie director Richard Donner. (This series will be retitled Circle Of Fear in 1973.)
Search: One Of Our Probes Is Missing
The second episode of Leslie Steven’s “spy-fi” series Search airs on NBC, starring Tony Franciosa and Burgess Meredith. Stefanie Powers (Hart To Hart) and Larry Linville (M*A*S*H) guest star.
Ghost Story: The Dead We Leave Behind
NBC airs the second episode of the supernatural anthology series Ghost Story, produced by 1960s horror movie mogul William Castle and starring Sebastian Cabot. Jason Robards and Stella Stevens guest star in a script written by Robert Specht (The Immortal, Ark II). (This series will be retitled Circle Of Fear in 1973.)
Search: The Murrow Disappearance
NBC premieres the first episode of Search, a “spy-fi” series created by Leslie Stevens (The Outer Limits) and starring Hugh O’Brian and Burgess Meredith. Maurice Evans (Planet Of The Apes) guest stars. The series pilot aired earlier in 1972 under the title PROBE.
Ghost Story: The New House
NBC airs the pilot episode of the supernatural anthology series Ghost Story, produced by 1960s horror movie mogul William Castle and starring Sebastian Cabot. Jeanette Nolan and Sam Jaffe guest star in a script by Richard Matheson (Twilight Zone, The Omega Man). The pilot gets enough attention for production to be greenlit on a series to premiere in the fall of 1972. (This series will be retitled Circle Of Fear in 1973.) Hear about it on the Sci-Fi 5 podcast