Spock must go to Vulcan in order to perform the Vulcan mating ritual.

The Enterprise encounters an alien who claims to be the greek god Apollo.

The Enterprise encounters an ancient Earth probe bent on the sterilization of all life.

Kirk and three of his officers are accidentally transported into a parallel ""mirror"" universe where violence, greed, and evil are commonplace.

Kirk attempts to assist a primitive people that are ruled over by a computer named Vaal.

The Enterprise must stop an ancient doomsday weapon that is capable of destroying entire worlds...and has already totalled one Constellation-class cruiser.

When a landing party disappears and one man is beamed up dead, Kirk and Spock investigate and meet a pair of aliens who seem capable of performing magic.

The Enterprise is taken over by a group of androids who are working for Kirk's old nemesis, Harry Mudd.

When their shuttle is diverted to a planetoid, Kirk meets one of the pioneers of space flight, Zefram Cochrane.

Spock meets his estranged father when the Enterprise escorts a group of ambassadors to a conference on the planet Babel.

Kirk, Spock, and McCoy land on a primitive planet to negotiate a mining treaty, but soon find themselves involved with intrigue and must flee with a pregnant woman into the surrounding mountains.

A landing party, including the command staff, are infected with a disease that causes rapid aging and senility.

The Enterprise must deal with a creature from Kirk's past that feeds on human blood.

A serial killer stalks a planet...and Scotty is the prime suspect.

Kirk must defuse a Klingon scheme to destroy a grain shipment...and cope with a seemingly benign creature known as a tribble, which reproduces at amazing speed.

Kirk, Chekov, and Uhura are kidnapped and forced to participate in a series of gladiatorial games.

The Enterprise travels to a planet suffering from cultural contamination from an earlier expedition - the inhabitants mimic the culture of 1930's gangland Chicago.

The Enterprise must destroy an enormous space amoeba before it reproduces and threatens known space.

Kirk becomes involved in an arms race when the Klingons equip a native people with superior weaponry.

The Enterprise discovers three discorporeal intelligences who seek their help in gaining physical bodies...but one of them has plans of his own.

The Enterprise seek out a historical researcher and discover he has contaminated a culture, rendering it into a near-duplicate of Nazi Germany.

The Enterprise's command crew must thwart an invasion by aliens from another galaxy who plan to conquer this one.

The Enterprise investigates the disappearance of another starship and discovers a planet where the inhabitants are immortal...and engaged in a strange parallel of Earth's Cold War period.

The Enterprise is used to test a new super-sophisticated computer, but it soon develops a mind of its own.

Stardate 4040.7: The S.S. Beagle, missing for six years, is found as debris near Planet IV of System 982. Kirk, Spock, and McCoy beam down to the planet to investigate and find a ragged group of fugitive slaves trying to stay hidden from the police. These ""sun worshippers"" distrust the landing party but soon discover that they are not a threat. Kirk informs them that he is looking for another group of strangers led by a man named Merik. Merikus is the First Citizen of the Empire, but Kirk is not sure if it is the same man. Pursuaded to help them find Merik and his crew, the leader of the fugitives sends Flavius, an ex-gladiator, to be their guide. The landing party, however, is soon captured and led into the city where they discover a civilization much like 20th century Earth, but culturally similar to ancient Rome. The landing party find Merik, now First Citizen Merikus, who six years ago abandoned his ship and beamed his crew down to the planet. Those who could adapt survived, and th

Stardate not given: The Enterprise is sent on a mission back to Earth in the year 1968 to discover details about how the planet survived the arms race. While in orbit, the ship intercepts a transporter beam from an unknown part of the galaxy and beams the space traveler aboard. Surprised by what has taken place, the man identifies himself as Gary Seven and claims to be a 20th Century Earthman raised on an unknown world and trained to prevent Earth from destroying itself. Kirk decides to verify Seven's story before releasing him, but Seven escapes and beams down to the planet below. Kirk and Spock follow him to New York City, and Seven meanwhile discovers that two of his fellow agents have been killed in a auto accident. Seven is forced to complete their mission himself which is to sabotage an orbital nuclear platform, just low enough in the atmosphere to scare Earth leaders into prohibiting additional nuclear space weapons. Just as Kirk and Spock arrive, Seven beams out of his office a

Kirk and his crew are at deadly risk from an alien creature that feeds on the salt in a human body and can take on any form.

Stardate 1533.6: The Enterprise makes a rendezvous with the S.S. Antares and picks up a 17 year old boy, Charlie Evans who is the only survivor of a colony expedition that crashed on the planet Thasus. Captain Ramart and his staff rave about the boy, but Kirk can't help but be puzzled when Ramart refuses luxury items and hurries back to the Antares. Charlie, without social skills of any measure, seems a bit strange and unrefined but states that he grew up alone with only the record tapes from the wreckage for company. Sometime later, Captain Ramart signals the Enterprise and tries to warn Kirk about something, but just then the Antares is destroyed. Kirk doesn't think much about Charlie's disinterested reaction to the deaths of his former friends, but Spock begins to suspect that there is more to the boy than they know. This is confirmed when Charlie makes a crewman disappear for laughing at him while in the gym. During this time, Charlie becomes infatuated with the first ^girl^ he saw after coming aboard the Enterprise, Yeoman Rand. Unable to control his desires, Charlie pesters Rand until she is forced to hurt him, first by rejecting the boy and then by slapping him while in her quarters. This, of course, causes Charlie to make her disappear as well. Now realizing the full extent of Charlie's powers and the danger he could pose to civilization, Kirk tries to alter the ship's course away from their next stop, Colony 5, but Charlie learns of his plans, seizes control of the Enterprise, and locks in a course for Colony 5. By this time the Thasians, noncorporeal beings who really raised Charlie and gave him his powers, discover that the boy is missing and intercept the Enterprise. Despite Charlie's pleas not to be taken away, the Thasians remove Charlie from the Enterprise and restore the crew back to normal.

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

A strange alien substance causes the crew to act out their deepest inhibitions, while the ship plummets out of orbit.

A transporter malfunction causes Captain Kirk to split into his "good" and "evil" selves, and a landing party will freeze to death if they don't merge the two back together.

The Enterprise picks up a intergalactic conman, Harry Mudd, and three incredibly beautiful women who harbor a dark secret.

Nurse Christine Chapel is reunited with her old fiance on Exo III, but the scientist has plans for Captain Kirk and the Federation.

Kirk and a landing party are stranded on a planet due to a disease that causes any adult to die a painful death, and must deal with the local children who have survived.

Kirk investigates an experimental facility for holding prisoners and finds a sinister scheme.

The Enterprise encounters a vast alien ship that sets out to test them.

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.

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.

Kirk is one of the last survivors who can identify a mass killer, who lurks among a Shakespearean troupe aboard the Enterprise.

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

The Enterprise crew take shore leave on a peaceful, pastoral planet...where their dreams and fantasies come to life.

Spock commands a stranded away team when their shuttlecraft is stranded on a planet with hostile natives.

The Enterprise finds itself at the mercy of a seemingly omnipotent being who fancies himself a 18th century Englishman.

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.

The Enterprise collides with a black hole and is thrown back to Earth in the 20th century, where they must find a way back and erase any trace of their presence. Matters become complicated when they rescue an Air Force pilot and cannot return him without changing history...but if he disappears that will change history as well.

Captain Kirk's career is at stake when he is put on trial for the loss of a crewman during an ion storm.

The Enterprise encounters a seemingly peaceful civilization run by a ""benevolent"" being named Landru...who intends for them to join his people.

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

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.

The Enterprise crew is trapped in paradise when they come to rescue colonists who have fallen to pacifying alien spores and become infected themselves.

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

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

Kirk and Spock encounter an alien named Lazarus who claims to be from an anti-matter universe.

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

Kirk and the Enterprise must combat parasitic aliens.