Summary: 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.

Summary: 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.

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

Summary: 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.

Summary: 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.

Summary: 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.

Summary: 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.

Summary: 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.

Summary: 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.

Summary: 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.

Summary: 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.

Summary: 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.

Summary: 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.

Summary: 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.

Summary: 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.

Summary: 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.

Summary: 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)

Summary: 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.

Summary: 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.

Summary: 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.

Summary: 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.

Summary: 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.

Summary: 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.

Summary: 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.

Summary: 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.

Summary: New reports on a rash of Northern California pizza-restaurant robberies; the reunion of a millionaire and his daughter; and a fugitive's arrest in Colorado for kidnapping and murder. Repeat segments include U.S. intelligence reports suggesting there were survivors of a spy plane shot down over Laos in 1973; and the search for a fugitive con artist.

Summary: Segments include ghostly goings-on at a New Mexico hotel, and hauntings experienced by a couple who moved to a 109-year old Florida mansion. Also: an update on the arrest in Roanoke, Va., of a man who posed as a doctor to steal from patients. (Repeat)

Summary: Reports on the search for a Houston millionaire suspected of hiring two men to have his former lover killed; the mystery of a seemingly destitute Oregon woman, who left a $100,000 estate when she died in 1991; the reunion of a British Columbia man with his family.

Summary: ""The Diabolical Mind"" includes profiles of Adolf Hitler and Saddam Hussein; an interview with a convicted killer; and an examination of two chilling murder cases. (Repeat)

Summary: A new segment reports on a mysterious malady that has claimed the lives of six members of a Northern California family. Updates include the Alabama apprehension of a fugitive who reportedly murdered his estranged wife and her co-worker in 1988.

Summary: IRS and FBI efforts to stop a medical-investment scam operated by a team of con artists; the murders of two Swedish women vacationers, discovered in 1983 by deer hunters near Santa Barbara; a 17-year-old disappearance case, stumbled upon by a rock climber.

Summary: A report on a wealthy Phoenix woman who was found shot to death in her home in 1988. Also: repeat segments on law enforcement's case of psychics to solve cases, the search for a New Hampshire lawyer who embezzled from his clients and an amnesia victim who lost 16 years of her life because of a stroke.

Summary: Reports on a $1 million armored-car robbery in Vallejo, Cal., that left three employees dead; and a tip from an Oregon cop leading to the arrest of a Las Vegas woman wanted for forgery. Repeat segments include an unsolved 1985 murder-extortion plot in Denver.

Summary: Reports on the 1989 assault and murder in Louisiana of a 26-year-old Milwaukee woman; the 1991 kidnapping of an Austin, Texas, woman at a car wash; an adventurer's discovery of a formation on Turkey's Mount Ararat believed to be the remains of Noah's Ark.

Summary: A report on a case of mistaken identity that claimed a Phoenix man's life includes talks with experts who think the intended target was a reporter probing a murder case. Also: the 1986 murder of a 15-year-old boy at his Long Beach, N.Y., school dormitory; an $11 million armored-car heist; an adopted woman's search for her twin brother.

Summary: Reports on a man's seven-year attempt to regain custody of his son; and the Texas arrest of a Tennessee woman who allegedly murdered her aunt and uncle. Also: repeat segments on the search for perpetrators of evangelist mail bombings; the hunt for a Fort Pierce, Fla., con-artist team.

Summary: Reports in this expanded edition include the search for the killer of an elderly Washburn, Texas, man. Also: repeat segments on a Virginia man whose investigation into UFO sightings threatened his credibility; an Oregon bank teller who helped identify a career bank robber; new evidence in the 1968 assassination of Sen. Robert F. Kennedy.

Summary: New segments on claims of a murder coverup in two boys' deaths in a blazing shack; and a woman's reunion with her surrogate family with whom she lived during the Depression. Repeat segments: UFO sightings over Belgium, discussed by reported witnesses, the police and military personnel.

Summary: A report on the capture of a fugitive after his escape from a prison ward at a Chicago hospital. Also: repeat segment on the search for a reported homeless woman who may stand to inherit $100,000; the disappearance and subsequent death of a Madison, Wis., man.

Summary: An update on a Tennessee man's reunion with members of a family to whom he gave refuge during the Depression. Also: repeat reports on a Georgia man's search for his brother following a 1990 boating accident; the mystery of a caretaker who squandered the riches of an elderly widow.

Summary: Segments on an abusive grandmother who reportedly kidnapped her 2-year-old grandson; a man's search for his missing brother, who he suspects is a POW in Vietnam; two women in Manitoba who are searching for their estranged sister. (Repeat)

Summary: Reports on the arrest of a woman charged with kidnapping her 9-year-old son; the murderous aftermath of a Durant, Okla., jail escape by two killers; the murder of a Phoenix millionairess. (Repeat)

Summary: A new segment reports on a man's reunion with his daughter, ending a 43-year search for his only living relative, to whom he plans to bequeath an estate worth more than $1 million. Repeat segments include the disappearance of a Scottsdale, Ariz., bank-fraud investigator.

Summary: A report on the arrest in Vermont of a Florida man wanted for a deadly hit-and-run. Repeat segments include a New York con game using state-lottery tickets; and the efforts of a Minnesota man, convicted of murdering his wife, to prove his innocence.

Summary: This expanded edition reports on the FBI arrest of a fugitive in Commerce City, Colo.; the search for 17 tons of gold bullion buried since the 1930s atop a mesa in New Mexico; a suspected military coverup in the 1989 death of a Marine Corps captain; a reporter's undercover search for an Ohio serial killer.

Summary: Segments on the search for a Houston millionaire who reportedly hired two men to kill his former lover; a seemingly destitute Oregon woman who died and left a $100,000 estate; a series of late-night disappearances of women at Florida-area convenience stores. (Repeat)

Summary: Reports on IRS and FBI efforts to stop a medical-investment scheme; the murders of two vacationing Swedish women, discovered in 1983 by deer hunters near Santa Barbara; a woman's claims that her son's death in a blazing shack was a murder coverup. (Repeat)

Summary: Reports on a botched armored-car heist in Vallejo, Cal., that left three guards dead; a woman's search for the baby she was forced to give up for adoption 27 years ago; a rock climber's grisly discovery that reopened a 17-year-old murder case. (Repeat)

Summary: Among the segments is an update on two hitchhikers who may have information on a suspect in an unsolved Texas murder. Also: repeat reports, including the case of mistaken identity that claimed the life of a Phoenix computer draftsman in May 1990.

Summary: Updates include the reunion of a family of Ojibwa sisters from Manitoba, Canada; the 1991 prison release of a Hillsboro, Mo., woman. Also: repeat reports on the search for a truck driver who kidnapped a woman in Clinton, Mo.; and a mysterious medical condition that claimed the lives of six family members.

Summary: A viewer tip leads to the arrest of a Rollingwood, Texas, woman suspected or robbing and murdering her aunt and uncle in Tennessee. Repeat reports: an adventurer's search for the Abominable Snowman of the Himalayas; a woman's search for her twin brother.

Summary: A new segment on an Illinois man's finding that he has an identical twin brother and possibly a half sister; and an update on a couple's reunion with the daughter they gave up for adoption at birth.

Summary: Reports on the possible wrongful murder conviction of an Aurora, Mo., man; a woman who draws uncanny likenesses of people she's never met who have died; the mysterious poisoning death of a North Dakota man. (Repeat)

Summary: A segment on a man wanted by San Francisco authorities for the strangling of his girlfriend and the attempted murder of her aunt; an update on a man's search for his missing sister. Included in repeat reports: the search for the killer of a 26-year-old woman.