Conspiracy

After old friend Walker Keel warns him of strange changes in Starfleet Command and the Horatio is destroyed, Picard takes the Enterprise to Earth. He and Riker find parasites controlling Admirals Savar, Aaron and Quinn, and kill the mother creature inside Commander Remmick.

• Follows Coming of Age (S01E19): Admiral Quinn's warning in Coming of Age of a threat from inside or outside the Federation is recalled when the parasite conspiracy is uncovered; Remmick returns as the host.

officer's log, stardate 41775.5. We are en route to the ocean world of Pacifica. While our mission is scientific in nature, we look forward to the warm blue waters and fine beaches that make Pacifica a jewel of the galaxy.

Captain's personal log, stardate 41776.1. The apparent death of Walker Keel has had a powerful impact on me. I now believe there may be a cancer growing within the ranks of Starfleet. As a result, I have alerted my Executive Officer to the suspicions voiced by Keel and the others.

Captain's personal log, supplemental. While it is quite unusual for a starship to return to Earth, we seem to be left with no other choice. I have apprised the remaining bridge crew of our situation.

Captain's log, stardate 41780.2. How difficult after all these years of learning to respect life, to be forced to destroy it. But there seems to be no alternative. Admiral Quinn is expected to make a full recovery. There is no trace of the parasite which took control of him. We'll never know how many of these life forms infiltrated Starfleet, but it seems they could not survive without the mother creature which had taken over Commander Remmick.

From Memory Alpha. Linked where the credit could be matched to a transcript label.

Starring

• Patrick Stewart as Captain Jean-Luc Picard (Captain Jean-Luc Picard)
• Jonathan Frakes as Commander William T. Riker (Commander William T. Riker)

Also starring

• LeVar Burton as Lt. Geordi La Forge (Lieutenant Commander Geordi La Forge)
• Michael Dorn as Lt. Worf (Lieutenant Worf)
• Gates McFadden as Doctor Beverly Crusher (Dr Beverly Crusher)
• Marina Sirtis as Counselor Deanna Troi (Counselor Deanna Troi)
• Brent Spiner as Lt. Commander Data (Lieutenant Commander Data)

Guest stars

• Henry Darrow as Savar
• Ward Costello as Gregory Quinn (Admiral Gregory Quinn)
• Robert Schenkkan as Dexter Remmick (Dexter Remmick)
• Ray Reinhardt as Aaron
• Jonathan Farwell as Walker Keel
• Michael Berryman as Captain Rixx
• Ursaline Bryant as Captain Tryla Scott

Uncredited co-stars

• James G. Becker as Youngblood
• Majel Barrett as Computer Voice
• Jeffrey Deacon as command division officer
• Steve Casavant as Longo
• Dexter Clay as operations division officer
• Susan Duchow as Starfleet officer
• Nora Leonhardt as science division ensign
• Tim McCormack as Bennett
• Lorine Mendell as Diana Giddings
• Steve Reed as Enterprise -D science officer
• Richard Sarstedt as command division officer
• Gary Wayton as Starfleet Headquarters security officer