Beginning a fourth season: U.S. military officers discuss a 1980 sighting of an unidentified flying craft near a U.S. air base in England. Also: the murders of two Texas teens reportedly involved with a cult; a Nashville, Tenn., woman's discovery about her parentage.

New theories in the death of Lincoln assassin John Wilkes Booth; the disappearance of a 65-year-old man with no past; and the search for a convicted child abuser.

Reports: an amnesiac found unconscious in the Las Vegas desert; the grisly murder of a Virginia woman; the controversy surrounding the Shroud Of Turin.

The hunt for a suspected serial killer who's been stalking women in Connecticut since 1981; the search of Florida siblings for their twin brother and sister, who were adopted as infants; the first-time meeting of a father and his 32-year-old daughter.

U.S. intelligence reports suggesting that there were survivors of a spy plane shot down over Laos in 1973; the search for a fugitive con artist who defrauded the elderly out of millions; a West Virginia woman's reunion with her twin sister's four sons.

Reports on suspicions surrounding the disappearance of an Oregon police officer's son; an Indiana man's search for a friend and father figure of 20 years ago; the hunt for a man who reportedly murdered his estranged wife and her co-worker in front of witnesses; the recovery of a Maryland amnesia victim.

Segments include reports of ghostly goings-on at a New Mexico hotel, and hauntings experienced by a couple who moved to a 109 year old Florida mansion last year. Also: the search for a con man who poses as a doctor to steal jewelry, coins and computers.

This special edition focuses on what producers call ""the diabolical mind."" Included: profiles of Adolf Hitler and Saddam Hussein; an interview with a convicted murderer.

Reports on a case of past-life regression; the search for a couple reportedly involved in a Christmastime fraud escapade; a 1985 murder-extortion plot in Denver; the disappearances of Florida convenience-store workers.

A repeat report on crime fighter Eliot Ness's efforts to solve the case of a 1930s Cleveland serial killer. Also: new reports on law enforecement's use of psychics to solve cases; an investigation into the death of a North Dakota woman; and a Maryland amnesia victim.

Included: a woman's search for the police officer who risked his job to free her from an unjust sentence; new evidence in the case of a mother jailed for the death of her son; the hunt for a Fort Pierce, Fla., con-artist team who reportedly committed murder.

UFO sightings over Belgium are discussed by reported witnesses, the police and military personnel. Also: the disappearance of a Michigan company president, charged with embezzlement; questions surrounding a police chief's death.

Reports on the FBI arrest of a fugitive in Commerce City, Colo.; a possible military coverup in the 1989 death of a Marine Corps captain; the search for a Florida church arsonist; the discovery by two women that they are sisters and a report on an impostor.

Reports on the murderous aftermath of Durant, Okla., jail escape by two killers; the suspicious death of a man who squandered an elderly widow's money; two brothers' search for the mother they haven't seen in 42 years; the abduction of a 6-year-old boy.

Reports: a con game using state lottery tickets that took in millions of dollars in New York state alone; the search for a homeless person who may stand to inherit $100,000; a former runaway's search for three of her nine estranged siblings.

Segments on an abusive grandmother who reportedly kidnapped her 2-year old grandson; a convicted murderer who claims he's innocent in his wife's 1983 murder; a fugitive's capture outside Birmingham, Ala; and two Ojibwa sisters from Manitoba who are searching for their estraged sister.

U.S. military officers discuss a 1980 UFO sighting near a U.S. air base in England. Other segments include the murders of two Texas teens reportedly involved with a cult. (Repeat)

Repeat segments on new theories in the death of Lincoln assassin John Wilkes Booth; and the disappearance of a 65-year-old man with no past. Also: viewer tips leading to the arrest of a fugitive child molester.

Reports on the 1988 disappearance of a Washington State student who picked up a hitchhiker and was never seen again; a Georgia man's search for his brother, who he suspects is still alive following a 1990 boating accident; the search for a ""love child"" who stands to inherit $24 million.

Repeat reports on the grisly murder of a Virginia woman; an amnesiac found unconscious in the Las Vegas desert; the controversy surrounding the Shroud of Turin; and the search for the husband of a murdered Rochester, N.Y., woman.

Reports on a Tennessee man's search for a family to whom he gave refuge during the Depression; the homicide death of a North Dakota woman previously thought to have died in a car fire; and the search for a fugitive who escaped from a hospital prison ward.

Reports on the disappearance of a Scottsdale, Ariz., bank-fraud investigator who had probed money laundering; a mother-daughter financial scheme; the FBI search for a mother who reportedly kidnapped her son to raise him in a fundamentalist sect.

A report (postponed from last week) on a clever mother-daughter financial scheme; evidence that some claim substantiates the existence of the elusive Big Foot; the hunt for a Florida man wanted in connection with hit-and-run homicides.

Reports in this expanded edition include a Virginia man whose investigation of UFO sightings threatened his credibility; a Columbus, Ohio, reporter who went undercover in a search of a trucker responsible for murdering prostitutes; a repeat segment detailing new evidence in the 1968 assassination of Sen. Robert F. Kennedy. Also: an Oregon bank teller who helped identify a career bank robber; a haunted New Jersey mansion; and viewer tips leading to the apprehension of three fugitives.

The hunt for suspects in a slick Henderson, Nev., bank robbery; the search for a woman who murdered her aunt and uncle near Chattanooga, Tenn., and stole their savings; an Abilene, Texas, children's aid center whose adoption records were lost.