The Enterprise's computer has fallen prey to a mysterious electronic `virus' which has programmed it to self-destruct.
While preparing to face the Bothan alien species, the crew encounters an odd psionic field causing their deepest thoughts to become reality.
After confronting a black nebula while on an expedition, Tuvok is inhabited by aliens, and Chakotay appears to be brain dead.
Injured and stranded on a strange planet, Riker has to keep his identity secret in order to stay alive.
The time-travelling scientist Sam Beckett enters the world of the supernatural when he becomes a university ghostbuster assigned to protect a young woman from the deranged spirit of her deceased husband.
