Zama, Dr Shiro
A japanese scientist who performed hideous experiments in WWII,
as part of the 731 medical corps. He appears in the episodes 731
and Nisei on a train carrying what Mulder believed to be an
alien-human hybrid. Dr Zama was killed by the Red-Haired Man in
one of the train's toilets, and it turned out that the Red-Haired Man
was himself an NSA agent who was assigned to kill Zama before he
could take the results of his experiments to be sold outside the US.
Scully remembered seeing Zama hover over her during her
abduction, and believes he was responsible for putting the computer
chip inside her neck.
Allegedly a race of aliens (known as Grays) came from here. (James