Parasitic beings are taking control of Starfleet leaders in order to take over the Federation.

Henry Darrow (Admiral Savar)
Ward Costello (Admiral Gregory Quinn)
Robert Schenkkan (Lt. Cmdr. Dexter Remmick)
Ray Reinhardt (Admiral Aaron)
Jonathan Farwell (Capt. Walker Keel)

Michael Berryman (Captain Rixx)
Ursaline Bryant (Capt. Tryla Scott)

• Admiral Quinn and Lt. Cmdr. Remmick were introduced in the episode "Coming of Age".