While journeying to
Pacifica, the U.S.S. Enterprise receives an emergency
message for Captain Picard from Starfleet Captain Walker
Keel, who requests a secret meeting.
At a rendezvous on an uninhabited planet, Captain Keel
and two other Starfleet officers tell Picard that they
suspect a growing conspiracy in the upper ranks of
Alarmed by Keel's
accusations, Picard orders Lieutenant Commander Data to
review all Starfleet directives during the past six
months. Picard's concern escalates when Keel's vessel
mysteriously explodes, killing all aboard, and Data's
research reveals abnormalities in the highest levels of
the Starfleet command.
Federation's security is at risk, Picard steers the
Enterprise toward Earth to confront Starfleet's top
admirals. After requesting a meeting with the officers,
Picard and Riker are invited to dinner to discuss the
Prior to dinner,
Admiral Quinn, who several months earlier had warned
Picard that subversive elements had invaded Starfleet,
visits the U.S.S. Enterprise. Suspicious of the admiral,
Picard orders Riker to watch him closely before joining
him on Earth. Picard's instincts turn out to be correct:
as soon as Picard beams down to join the other admirals,
Quinn attacks Riker, rendering him unconscious.
After Lt. Worf and Dr.
Crusher join forces to subdue the incredibly powerful
Admiral Quinn, they discover that a parasitic being has
invaded Quinn's body and it is controlling all of his
brain functions. When Riker regains consciousness, he
beams down to Earth, pretending to be one of the
At the dinner, Riker
realizes that the Starfleet command is controlled by the
parasites. Fortunately, he and Picard are able to kill
the parasitic-infested admirals, as well as the species'
mother creature. However, Data later discovers that the
mother creature sent a homing beacon to an unexplored
region of our galaxy before being destroyed ...