The Man Called X — 1950

Returning to NBC, the series opens with a murder aboard the Istanbul Express and a box of custom-blended cigarettes that are far more than they seem.

In a return of an earlier case, Ken Thurston heads for the East Indies to trap 'The Fish Peddler' and his net of crime.

A transport-plane crash off the Greek coast and a murder in Athens draw Ken Thurston into a case turning on a possible cure for cancer.

An atomic scientist vanishes from Austria, and Ken Thurston sets out to find him.

A telegrapher is shot in Rangoon to stop a message getting out, and a fellow agent has disappeared, so Ken Thurston flies to Burma.

A Tibetan prayer wheel draws Ken Thurston to Lhasa.

A cryptographer's electronic deciphering machine and the cryptographer himself both go missing, sending Ken Thurston from Virginia to California through a maze of impostors.

Ken Thurston is sent to Guatemala to recover stolen cholera-virus serum.

In Syria, a smear of red mud helps Ken Thurston solve sabotage on an important pipeline.

A Christmas fantasy: Mr. X crashes the plane he is flying somewhere in the Middle East just before the holiday.

Witchcraft and death stalk a uranium mine in the Belgian Congo, and Ken Thurston goes to investigate.