Stardate 5693.2: The Enterprise arrives at the last known position of the U.S.S. Defiant (NCC-1764), an area of uncharted space, to search for the missing starship. When the Defiant appears on the viewing screen enshrouded in a strange green glow, Spock is unable to scan the vessel on his sensors. Kirk beams over to the Defiant with a boarding party to investigate and finds the entire crew dead. What's more, the Defiant seems to be trapped in an interphase between two different universes. A power loss partially disables the Enterprise transporter, but the landing party manages to beam back to the Enterprise except Kirk who suddenly disappears along with the Defiant. Spock calculates that the next time to interphase will be approximately two hours, and that the captain can be rescued at that time. As the Enterprise begins to experience the same problems that doomed the Defiant: power loss, weakness and insanity among the crew, an alien vessel appears and demands that they leave Tholian
Star Trek chronicles the 23rd century adventures of the U.S.S. Enterprise, one of twelve state-of-the-art starships representing Starfleet, the exploration branch of the United Federation of Planets, an alliance of alien races including Earth, Vulcan, Tellar, and Andor.
Captain James T. Kirk, the youngest starship captain in the Fleet, commands the Enterprise with a combination of brashness, authority, and imagination. The half-Vulcan/half-human Mr. Spock serves as his extremely logical and efficient First Officer and Science Officer. The ship's chief medical officer is Dr. Leonard McCoy, who has supreme medical authority on the ship and tends to the physical and mental needs of the Enterprise's crew of approximately 430.
Other ranking crew members include: Montgomery Scott, a man dedicated to his ship engines but not adverse to a bit of shore leave; Hikaru Sulu, helmsman and a man of many hobbies ranging from botany to fencing, Nyota Uhura, the extremely competent head of Communications, and Pavel Chekov, brash young navigator with a fierce pride in his native Russia.