While Ponch is in hospital, Jon and a new partner investigate several thefts involving city vehicles.
Sketches include ""Kennedy in '80,"" ""Banshee,"" ""The Black Shadow,"" ""The Landers Files,"" ""Mr. Bill at Home,"" ""Nick in the Arctic,"" ""Eleanor Roosevelt,"" ""Sports Hot Line,"" and ""Big n' Tall That's All."" Chicago performs their 1970 hit ""I'm a Man"" and their then-current single ""Street Player.""
As Bobby bonds with the ranch hand's son, Pam informs him that their unborn child may have a fatal genetic defect. Meanwhile, J.R. hires a man to tail Sue Ellen.
The Prairie Dog Glee Club sings very well, but Scooter says they have "pack rat blood in 'em -- they keep stealing everything!" The prairie dogs go wild, taking everything Kermit has -- including his collar, which leaves him naked on stage.
Racing legend Cale Yarborough is working on a secret turbocharger. When the grimy Jethro brothers and slimy Boss Hogg start snooping around, it's up to the Dukes to save Cale's tail.
As a medic for a rodeo, David discovers that an aging cowboy has a serious health condition that could prove fatal; meanwhile, the cowboy's younger brother is mixed up with a gang of cattle thieves.
By permission of Mr. Grace, Mrs. Slocombe moves into a display apartment in Grace Brothers, because her new home is occupied by squatters. Due to a transport strike, Mr. Humphries seeks to join her in her new accommodations.
With Sapphire unconscious, Steel is unnerved by the appearance of her ghost on the railway platform with the other spirits. After Tully agrees to watch over Sapphire's body, Steel has a chat with her ghost to determine if she is real or a trick perpetrated by the darkness. The soldier is not through with trying to get rid of Steel, however, and snares him in barbwire. Meanwhile, the darkness makes a deal with Tully: he can escape the station unharmed if he leaves Sapphire and Steel while they are unconscious and vulnerable.
Real Burt calls Mary, but Alien Burt intercepts Mary on her way to meet him. Jessica confronts Chester with her suspicions that he is cheating again. Eunice tells Corinne that she's fallen out of love with Dutch. Corinne spots Chester with another woman in a restaurant. Billy and Leslie sneak away to a romantic restaurant, only to run into several familiar faces. Tim and Corinne decide to divorce.
Ashley Longworth Jr. comes back and asks Erin to be his wife. She has some serious doubts after he says he has lost his faith in God.
Governor Gatling wants the staff to join him on his little vacation to a snow cottage. Benson agrees when he learns that Kraus will not attend. Later Kraus changes her mind and Benson has to live with it. He has to live with it harder when the staff gets snowed in.
Buck masquerades as a convict to break into a prison in an attempt to rescue Jen Burton, who took the blame for a murder her boyfriend, a shipping pirate, really committed. The Earth Defense Directorate believes that she can supply information to put the pirate in jail. Breaking out of the underground prison, Buck and the woman head for a nearby spaceport for return to Earth, but they are pursued by an indestructible android prison guard.
A bookstore owner is infuriated when a strip club opens near his place of business; and man is convinced that he is on the verge of spontaneous combustion.
When a young woman who is supposed to be in prison is found dead at the scene of a robbery, the Angels are called in to investigate. Kris enters prison undercover to find the thieves.
Following the devastation at Ringstone Round, Quatermass hears of similar incidents worldwide and returns to London with district commissioner Annie Morgan and a Ringstone 'survivor' Isabel. En route they become separated in a shootout between rival gangs. Meanwhile, the beam of light descends again - near Joe Kapp's home.
Three Bradfords struggle to meet the expectations of others: Nicholas turns truant to escape the long shadow of his siblings; Tom's boss pressures him to participate in a father-son golf tournament; Nancy feels compelled to date a stockbroker uniquely positioned to help David's slumping business.
The Drummond family celebrates the day Arnold and Willis are supposed to be officially adopted until the visit of a ""relative"" leaves their plans in jeopardy. Whitman Mayo guest stars as Jethro Simpson, who sees his way to go from junk to jewels in a last will and testament leaving a fortune to Willis and Arnold.