Episode Title: "THE THOLIAN WEB"
Production Number: 64
Original Air Date: 11-15-68
The U.S.S. Enterprise is searching for the U.S.S. Defiant, which disappeared three weeks ago. The crew locates the missing starship in an area of space that is phasing between dimensions. Captain Kirk leads a landing party to the Defiant, and finds the crew dead, apparently killed by each other. The Defiant phases into another universe while Captain Kirk is still aboard, and members of the Enterprise crew become increasingly agitated from the dimensional interphase effects.
As the Enterprise waits for Kirk and the Defiant to phase back into normal space, a Tholian ship arrives and Commander Loskene claims the Enterprise is in a territorial annex of the Tholian Assembly and orders the Enterprise to leave.
Dr. McCoy creates a diluted theragen derivative to reverse the dimensional phase effects on the crew. The Enterprise phases between dimensions to recover Captain Kirk, and uses the dimensional interphase to escape the tractor web that the Tholian ships have woven around the Enterprise.
Factoid: Theragen is a nerve gas used by the Klingons, and is deadly in its pure form.
Guest Characters: Lt. O'Neil, Nurse Christine Chapel
Alien Races: *Tholians
Starships: *U.S.S. Defiant
KEY: [brackets]=illusions *star=first appearance