The Best Episodes of Star Trek

Kirk and Spock must travel into the past in order to correct a change that will alter history.

Director: Joseph Pevney

Writer: D.C. Fontana, Harlan Ellison

A transporter mishap swaps Captain Kirk and his companions with their evil counterparts in a parallel universe. In the so-called Mirror Universe, the Enterprise is a ship of the Terran Empire, an organization as evil as the United Federation of Planets is benevolent.

Director: Marc Daniels

Writer: Jerome Bixby

Kirk pits the Enterprise against an invisible spaceship testing the Federation's defenses.

Director: Vincent McEveety

Writer: Paul Schneider

The Enterprise picks up a crew of genetic supermen from the 20th century... and their leader, Khan, plans to create a new empire.

Director: Marc Daniels

Writer: Gene L. Coon, Carey Wilber

The Enterprise must protect a very important shipment of grain from both Klingons and some adorable creatures called tribbles.

Director: Joseph Pevney

Writer: David Gerrold

First Officer Spock returns to his home world for a brutal Vulcan mating ritual.

Director: Joseph Pevney

Writer: Theodore Sturgeon

The starship Enterprise and its heavily-damaged sister ship, the USS Constellation, must work together to stop an alien planet-killing machine headed for the heart of Federation territory.

Director: Marc Daniels

Writer: Norman Spinrad

The Enterprise must transport dignitaries to a peace conference, with an assassin on the loose.

Director: Joseph Pevney

Writer: D.C. Fontana

The crew of the Enterprise are on a secret mission to steal a Romulan cloaking device.

Director: John Meredyth Lucas

Writer: D.C. Fontana

Kirk investigates a series of grisly murders on a mining planet that are the work of a seemingly hostile alien creature.

Director: Joseph Pevney

Writer: Gene L. Coon

Spock kidnaps his former captain, the crippled Christopher Pike, and heads for a quarantined planet, putting his career and Kirk's life on the line.

Director: Marc Daniels, Robert Butler

Writer: Gene Roddenberry

Spock's court-martial continues as he attempts to justify his abduction of Pike, the theft of the Enterprise, and his heading for a planet declared forbidden by Starfleet.

Director: Marc Daniels, Robert Butler

Writer: Gene Roddenberry

The Federation and the Klingon Empire teeter on the brink of war as Kirk investigates Organia, a humble planet, inhabited by pacifists, that is unwittingly caught in the middle.

Director: John Newland

Writer: Gene L. Coon

Kirk, Spock and McCoy are trapped in two parts of another planet's past - a world threatened with destruction when its sun goes supernova.

Director: Marvin J. Chomsky

Writer: Jean Lisette Aroeste

The Enterprise encounters a vast alien ship that threatens the Enterprise with destruction.

Director: Joseph Sargent

Writer: Jerry Sohl

The Enterprise arrives at a planet to establish diplomatic relations and finds itself in the middle of a "peaceful" war that threatens to destroy the ship.

Director: Joseph Pevney

Writer: Gene L. Coon, Robert Hamner

A skeleton Enterprise crew are assigned to test a revolutionary computer system that is given total control of the ship.

Director: John Meredyth Lucas

Writer: D.C. Fontana, Laurence N. Wolfe

Captain Kirk is caught between dimensions while the crew of the Enterprise works to retrieve him. All the while, the Tholians demand that the Enterprise leave their space.

Director: Ralph Senensky, Herb Wallerstein

Writer: Judy Burns, Chet Richards

When a mysterious alien race destroy an Earth colony, the Enterprise pursues, but Kirk and the alien captain are forced to fight each other by powerful aliens.

Director: Joseph Pevney

Writer: Fredric Brown, Gene L. Coon

In a freak accident the Enterprise is sent back to 20th century Earth, and must find their way back without changing history.

Director: Michael O'Herlihy

Writer: D.C. Fontana

A strange alien substance causes the crew to lose their inhibitions.

Director: Marc Daniels

Writer: John D. F. Black

The Enterprise crew try to rescue colonists from deadly radiation, but instead encounter strange alien spores that seem to offer paradise.

Director: Ralph Senensky

Writer: D.C. Fontana, Jerry Sohl

While exploring the edge of the galaxy, the Enterprise encounters an energy barrier that gives some crewmen strange powers.

Director: James Goldstone

Writer: Samuel A. Peeples

The Enterprise visits a planet with an Earth-like 1920s gangster culture.

Director: James Komack

Writer: Gene L. Coon, David P. Harmon

An alien force drives the crew of the Enterprise into brutal conflict with the Klingons.

Director: Marvin J. Chomsky

Writer: Jerome Bixby