An old friend of Doc's, a nurse, is visiting and he hopes she will stay around Dodge. In the meantime Matt is worried that an ex-con is gunning for him even though he thought he was innocent five years ago.
Diego's uncle, Estevan de la Cruz, arrives in Los Angeles for an unannounced visit and surprises the de la Vegas when he tells them he plans to be their house guest. Furthermore, he expects them to give a lavish party to welcome him. All of this angers Don Alejandro, but to head off a family dispute, Diego convinces his father that Estevan will leave soon.
Matt Conroy is startled when on their honeymoon his wide-eyed, Louisiana-drawling wife Sally suddenly becomes a determined and demanding woman with no accent who denies even knowing him.
Wes Carney and his wife Clair want to settle down and they figure North Fork might do fine. Wes is a well known gunfighter, who has promised Clair that he would hang up his guns for good. The Carney's want to live a simple, honest life and the Feed and Grain Store, which is up for sale, seems like it might work for them. Carney's reputation and the news that he's settling down brings troublemakers to North Fork. Lucas is the only man willing to stand as deputy with Micah. After Lucas tells the Carney's a story, Clair releases Wes of his promise and the three men take on the troublemakers. After the showdown, Clair announces that Wes will be taking the Sheriff's position he was offered in another town, if it's still available.
Quatermass plans to use an invention of Roney's, an "optic-encephalogram", to see these visions. The device will record impressions from the optical centres of the brain, in effect showing whatever the subject is seeing, hallucinatory or not. He wears the device and goes into the craft, but it is Roney's assistant, Barbara Judd, who is affected most. Placing the device on her, they record what she "sees"—a violent, bloody purge of the Martian hive, to root out unwanted mutations.
Two construction engineers are between more than just a rock and a hard place when one of them discovers the other's violent past during an explosive tunnel blast.
Bret and Bart's devotion to one another is tested when they're offered a deal that can mean $10,000 for one of them, but just one.
A man's house is burned and his livestock killed, but he refuses to identify the perpetrators to the marshal.
It is time to send the tax money to the governor, and Sergeant Garcia has a plan to thwart any attempt to steal the funds during the long journey. He orders the town blacksmith to build a huge iron box that requires a special key to open it. The money will be placed in the box and the key sent to the governor by a separate route.
Frank Blandon, a man with only one good arm, wanders on to the ranch. Lucas gave Blandon a job to ""hire him and Mark a clear conscience"". General Sheridan and his patrol wandered by and Lucas offered to let them stay the night at the ranch. Blandon pulled a gun on General Sheridan, as it turned out Blandon was a confederate soldier, who once had General Sheridan in his gun sight during the war. Blandon hung fire, but Sheridan did not hesitate and blew out Blandon's shoulder. General Sheridan shamed Blandon out of exacting his revenge, then lifted Blandon's spirit by praising Johnny Rebs' fighting spirit. Sheridan ordered that Blandon be taken to a hospital to have his shoulder properly mended, carrying out his Commander in Chief's last order to ""Bind up the Nation's wounds.""
Following the drilling attempt, a hole has somehow opened up in the wall which allows Quatermass and the others access to the interior chamber. There they find the remains of insect-like aliens resembling giant three-legged locusts, with stubby antennae on their heads giving the impression of horns. As Quatermass and Roney examine the remains, they theorise that the aliens might have come from a nearby planet which was habitable five million years ago — Mars.
Motherly love knows no bounds when a woman decides to get revenge on the married man who has been dating her daughter.
Bret, seeking buried Confederate treasure in Elwood, Kansas, keeps running afoul of U.S. Marshal Mort Dooley. The marshal keeps running Bret out of town. Bret, in turn, keeps outwitting the lawman.
Matt goes along with a hoax when Chester's aging Uncle Wesley arrives for a visit. Wesley thinks Chester is the marshal and Dillion is his assistant.
Two indentured servants who wish to marry find that the law states they must have the permission of their masters. Buena, who works in the de la Vega hacienda, is told she is free to marry, but her boyfriend, Romaldo, is not so fortunate. One of his co-workers also wants to marry Buena so he convinces their boss that Romaldo plans to run away after the ceremony.
Ward Haskins guns down Joe Flecker, who has evidence that could be used to blackmail him. Haskins thinks the information was given to Lucas, since he brought Flecker to the doctor before he died. Stirred up by Haskins behavior, Lucas goes through Flecker's things, finding a wanted poster for Haskins in the sole of Flecker's boot. He also finds Doc Burrage drinking. Doc is discouraged because three children have died of an anthrax epidemic that he has the new serum for, but nobody is willing to allow him to administer it in time. Haskins rides out to the ranch and is bitten by Flecker's horse, which is now believed to have anthrax. Mark overhears about how anthrax always causes death and is worried because he had bitten by Flecker's horse, also.
The shell of the object is so hard that even a borazon drill makes no impression, and when the attempt is made, strange vibrations cause severe distress in the people around the object. Quatermass interviews the local residents and discovers that sightings of ghosts and other poltergeist activity have been common in the area for decades. Meanwhile, a soldier is carried out of the object in hysterics — he claims to have seen a dwarf-like apparition walk through the wall of the artefact, a description which matches a 1927 newspaper account of a ghost sighting. Following the drilling attempt, a hole has somehow opened up in the wall which allows Quatermass and the others access to the interior chamber.
A funeral parlor owner is put in an awkward position when a deceased client comes back to life and demands a much smaller affair than what was planned for his funeral.