- #31 Metamorphosis
- Produced in 1967
- Author: Gene L. Coon
- Directed by Ralph Senensky
-
- CAST
- William Shatner as Captain Kirk,
- Leonard Nimoy as Spock,
- Deforest Kelley as McCoy,
- James Doohan as Scott,
- George Take as Sulu,
- Glenn Corbett as Cochrane and others.
-
- Stardate: 3219.8
- While transporting a Federation official to a vital
diplomatic mission, the Enterprise crew find historic space scientist Zefram Cochrane,
still alive on a distant planetoid, and cared for by an energy life-form called the
Companion.
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#32 Friday´s Child
- Produced in 1967
- Author: D.C. Fontana
- Directed by Joseph Pevney
-
- CAST
- William Shatner as Captain Kirk,
- Leonard Nimoy as Spock,
- James Doohan as Scott,
- George Takei as Sulu,
- Nichelle Nichols as Uhura,
- Julie Newmar as Eleen and others.
-
- Stardate: 3497.2
- The Enterprise crew becomes embroiled in a local
power struggle on planet Capella IV when Klingons attempt to gain mining rights there.
- Kirk in "Friday´s Child"
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- #33 Who Mourns for Adonais?
- Produced in 1967
- Author: Gilbert Ralston
- Directed by Marc Daniels
-
- CAST
- William Shatner as Captain Kirk,
- Leonard Nimoy as Spock,
- Deforest Kelley as Dr. McCoy,
- James Doohan as Scott,
- George Takei as Sulu,
- Nichelle Nichols as Uhura,
- Michael Forest as Apollo and others.
-
- Stardate: 3468.1
- The Enterprise is captured by a powerful alien who
was once worshipped on planet Earth as the Greek god Apollo. He wants the Enterprise crew
as his new subjects, and one Enterprise crew member to love him.

- "Who Mourns for Adonais?"
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- #34 Amok Time
- Produced in 1967
- Author: Theodore Sturgeon
- Directed by Joseph Pevney
-
- CAST
- William Shatner as Captain Kirk,
- Leonard Nimoy as Spock,
- Deforest Kelley as Dr, McCoy,
- James Doohan as Scott,
- George Takei as Sulu,
- Nichelle Nichols as Uhura,
- Celia Lovsky as T´Pau and others.
-
- Stardate: 3372.7
- Spock experiences the Vulcan mating drive and must
return home to take a wife. This is the first episode in which the greetings "peace
and long life" and "live long and prosper" were used. Also seen for the
first time were the Vulcan hand salute, invented by Leonard Nimoy, and the planet Vulcan
itself.

- Spock and T´Pring in "Amok Time"
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- #35 The Doomsday Machine
- Produced in 1967
- Author: Norman Spinrad
- Directed by Marc Daniels
-
- CAST
- William Shatner as Captain Kirk,
- Leonard Nimoy as Spock,
- Deforest Kelley as Dr. McCoy,
- James Doohan as Scott,
- George Takei as Sulu,
- Nichelle Nichols as Uhura,
- William Windom as Decker and others.
-
- An ancient weapon that destroyed the civilization
that invented it is now destroying planets in Federation space.

- "The Doomsday Machine"
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- #36 Wolf in the Fold
- Produced in 1967
- Author: Robert Bloch
- Directed by Joseph Pevney
-
- CAST
- William Shatner as Captain Kirk,
- Leonard Nimoy as Spock,
- Deforest Kelley as Dr. McCoy,
- James Doohan as Scott,
- George Takei as Sulu,
- Nichelle Nichols as Uhura,
- Jon Fiedler as Mr.Hengist and others.
-
- Stardate: 3614.9
- Scott is accused of murdering two women on a peaceful
planet, but the culprit is an evil entity that was once known as Jack the Ripper.

- Mr.Scott in "Wolf in the Fold"
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- #37 The Changeling
- Produced in 1967
- Author: John M. Lucas
- Directed by Marc Daniels
-
- CAST
- William Shatner as Captain Kirk,
- Leonard Nimoy as Spock,
- Deforest Kelley as Dr. McCoy,
- James Doohan as Scott,
- George Takei as Sulu,
- Nichelle Nichols as Uhura,
- Majel Barret as Chapel and others.
-
- Stardate: 3541.9
- An ancient space probe launched from Earth centuries
ago returns to Federation space on a bizarre mission to search for perfect life.

- Nomad and Kirk in "The Changeling"
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- #38 The Apple
- Produced in 1967
- Author: Max Ehrlich
- Directed by Joseph Pevney
-
- CAST
- William Shatner as Captain Kirk,
- Leonard Nimoy as Spock,
- Deforest Kelley as Dr. McCoy,
- James Doohan as Scott,
- George Takei as Sulu,
- Nichelle Nichols as Uhura,
- Keith Andes as Akuta,
- Celeste Yarnall as Yeoman Landon and others.
-
- Stardate: 3715.3
- The Enterprise encounters a primitive humanoid
culture on an Eden-like planet controlled by a machine-god known as Vaal.

- Vaal (left) Spock, McCoy and Kirk (right) in
"The Apple"
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- #39 Mirror, Mirror
- Produced in 1967
- Author: Jerome Bixby
- Directed by Marc Daniels
-
- CAST
- William Shatner as Captain Kirk,
- Leonard Nimoy as Spock,
- Deforest Kelley as Dr. McCoy,
- James Doohan as Scott,
- George Takei as Sulu,
- Nichelle Nichols as Uhura,
- Barbara Luna as Moreau and others.
-
- A transporter malfunction sends Kirk and company into
a savage mirror universe. This was the first episode set in the mirror universe. Several
DS9 episodes were also set in this alternate reality.

- "Mirror, Mirror"
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- #40 The Deadly Years
- Produced in 1967
- Author: David P. Harmon
- Directed by Joseph Pevney
-
- CAST
- William Shatner as Captain Kirk,
- Leonard Nimoy as Spock,
- Deforest Kelley as Dr. McCoy,
- James Doohan as Scott,
- George Takei as Sulu,
- Nichelle Nichols as Uhura,
- Charles Drake as Commodore Stocker and others.
-
- Stardate: 3478.2
- Exposure to an unknown form of radiation causes
Enterprise crew members to age at an incredible rate.

- Kirk in "The Deadly Years"
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- #41 I, Mudd
- Produced in 1967
- Author: Stephen Kandel
- Directed by Marc Daniels
-
- CAST
- William Shatner as Captain Kirk,
- Leonard Nimoy as Spock,
- Deforest Kelley as Dr. McCoy,
- James Doohan as Scott,
- George Takei as Sulu,
- Nichelle Nichols as Uhura,
- Roger C. Carmel as Mudd and others.
-
- Stardate: 4513.3
- Harry Mudd returns, now the ruler of a planet of
beautiful androids. Mudd plans to use the androids to capture the Enterprise, but he
fails.
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- #42 The Trouble With Tribbles
- Produced in 1967
- Author: David Gerrold
- Directed by Joseph Pevney
-
- CAST
- William Shatner as Captain Kirk,
- Leonard Nimoy as Spock,
- Deforest Kelley as Dr. McCoy,
- James Doohan as Scott,
- George Takei as Sulu,
- Nichelle Nichols as Uhura,
- William Campbell as Koloth and others.
-
- Stardate: 4523.3
- Tribbles are unbelievably cute, but the trouble is
that they reproduce at an amazing rate. In 1996, Paramount Pictures paid tribute to the
30th anniversary of StarTrek with a special episode of StarTrek:Deep Space Nine, entitled
"Trials and Tribble-ations", in which Ben Sisko and his crew went back in time
to revisit the events of "The Trouble With Tribbles".

- Tribbles in "The Trouble With Tribbles"
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- #43 Bread and Circuses
- Produced in 1967
- Author: Gene Roddenberry/Gene L. Coon
- Directed by Ralph Senensky
-
- CAST
- William Shatner as Captain Kirk,
- Leonard Nimoy as Spock,
- Deforest Kelley as Dr. McCoy,
- James Doohan as Scott,
- George Takei as Sulu,
- Nichelle Nichols as Uhura,
- William Smithers as Merrick and others.
-
- Stardate: 4040.7
- Kirk, Spock, and McCoy are captured on an Earthlike
planet on which the Roman Empire never fell.

- "Bread and Circuses"
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- #44 Journey to Babel
- Produced in 1967
- Author: D.C. Fontana
- Directed by Joseph Pevney
-
- CAST
- William Shatner as Captain Kirk,
- Leonard Nimoy as Spock,
- Deforest Kelley as Dr. McCoy,
- James Doohan as Scott,
- George Takei as Sulu,
- Nichelle Nichols as Uhura,
- Jane Wyatt as Amanda and others.
-
- Stardate: 3842.3
- The Enterprise, assigned to transport ambassadors to
a critical diplomatic conference, becomes a hotbed of intrigue. One of the diplomats,
Spock´s estranged father, suffers a heart attack and will die without Spock´s help. This
is the first appearance of Sarek and Amanda, Spock´s parents and we get to know there
that Spock and Sarek both have a rare Vulcan blood type: T-negative

- McCoy tries out the Vulcan Greet
- in "Journey to Babel"
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- #45 A Private Little War
- Produced in 1967
- Author: Jud Crucis
- Directed by Marc Daniels
-
- CAST
- William Shatner as Captain Kirk,
- Leonard Nimoy as Spock,
- Deforest Kelley as Dr. McCoy,
- James Doohan as Scott,
- George Takei as Sulu,
- Nichelle Nichols as Uhura,
- Walter Koenig as Chekov,
- Nancy Kovack as Nona and others.
-
- Stardate: 4211.4
- The peaceful society on a primitive planet is
shattered when Klingons provide firearms to the inhabitants.
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