Below is a list of all appearances of Klingons (excluding appearances of Worf and B'Elanna Torres), with a brief description of the episode or movie.
- "Broken Bow" - Earth launches its first starship of exploration, Enterprise, on a mission to return an injured Klingon to his homeworld. (Series
- "Unexpected" - When Trip Tucker assists an alien vessel with repairs, a "friendly" encounter with one of the crew leads to rather unexpected
- "Sleeping Dogs" - While exploring a gas giant, the Enterprise finds the wreck of a Klingon scoutship sinking into the atmosphere.
- "Marauders" - Enterprise discovers a deuterium mining colony that is being controlled by Klingon marauders. The crew trains the colonists to defend
themselves and prepare for battle against their Klingon oppressors.
- "Judgment" - Archer is charged by a Klingon tribunal for helping rebels try to escape the Empire.
- "Bounty" - Archer is captured by a Tellarite bounty hunter who plans to hand him over to the Klingons.
- "The Expanse" - After a devastating attack on Earth by an alien probe of unknown origin, Enterprise is recalled and sent into a strange expanse on
a new, more vital mission.
- "Borderland" - Archer needs the help of a criminal to prevent war with the Klingons.
- "The Augments" - Dr. Soong's Augments devise a plot to wage war on the Klingons.
- "Affliction" - While Enterprise visits Earth for the launch of Columbia, Phlox is kidnapped and forced to help the Klingons deal with a grave
threat toward their species. (Part 1 of 2)
- "Divergence" - With Columbia's help, the Enterprise crew grapples with sabotage to their ship as they pursue the truth behind the kidnapping of
Phlox. (Part 2 of 2)
The Original Series: (7)
- "Errand of Mercy" - Kirk and Spock try to protect the planet Organia from the Klingons, but the natives don't want the Federation's help.
- "Friday's Child" - The Enterprise becomes involved in a local power struggle on planet Capella IV, where the Klingons want mining rights.
- "The Trouble with Tribbles" - A dispute over control of a planet brings Enterprise to a space station, where they must deal with Klingons, edgy
Starfleet Command officials, and a previously-unknown race of small, unbearably cute, voraciously hungry and rapidly-multiplying furry creatures.
- "A Private Little War" - On a planet with a primitive civilization, the Enterprise discovers that the Klingons are providing a Stone Age society
with increasingly-advanced weaponry.
- "Elaan of Troyius" - The Enterprise transports Elaan, Dohlman of Elas, to an arranged marriage on Troyius.
- "Day of the Dove" - An extremely powerful non-corporeal being brings the Enterprise and a Klingon ship in direct conflict with one another.
- "The Savage Curtain" - Kirk and Spock are forced to fight alongside such historical figures as Abraham Lincoln of Earth and Surak of Vulcan by
aliens who want to understand the concepts of "good" and "evil."
The Animated Series: (2)
- "More Tribbles, More Troubles" - While escorting a shipment of grain to Sherman's Planet, the Enterprise encounters three "old friends:" Koloth,
Cyrano Jones--and tribbles!
- "The Time Trap" - The Enterprise becomes trapped in the Delta Triangle, an area of space where many starships have gone missing. To make matters
worse, the ship also has to defend itself from the Klothos, a Klingon vessel captained by Kor.
The Next Generation: (27)
- "Hide and Q" - Q returns with a new test for the Enterprise. Can Commander Riker resist the power of the Q Continuum?
- "Heart of Glory" - Worf faces a test of loyalties when three fugitive Klingons come on board the Enterprise-D.
- "A Matter Of Honor" - Riker serves as an exchange officer on a Klingon warship.
- "The Emissary" - The Enterprise crew has to deal with a Klingon sleeper ship whose occupants don't know the Federation and Klingons are at peace.
On-board to help them is an emissary, who (coincidentally) is one of Worf's former love interests.
- "Shades of Gray" - Commander Riker fights for his life in sick-bay after he is infected by an alien parasite while on an away-mission. Dr. Pulaski
soon discovers that the only way to save Riker's life is to force his mind to relive painful memories. (Season finale)
- "Sins of the Father" - Worf is plunged head-first into the politics of the Klingon Empire when his deceased father is accused of treason.
- "Reunion" - Captain Picard is selected to arbitrate the selection of a new Chancellor for the Klingon Empire and, in doing so, find out who
dishonorably murdered the old Chancellor. Also involved is Ambassador K'Ehleyr, who has a surprise for Worf: their son.
- "The Drumhead" - An overzealous Starfleet admiral begins a witch-hunt aboard the Enterprise to find a conspiracy, eventually accusing Captain
Picard of treason.
- "The Mind's Eye" - En route to Risa, Geordi La Forge is taken prisoner by a Romulan ship and mentally conditioned to assassinate a Klingon governor
in order to implicate the Federation as enemies of the Empire and unbalance relations between the two governments.
- "Redemption" - Picard balances his Federation and Klingon duties as new Klingon Chancellor Gowron faces a civil war, and Worf fights to regain his
father's honor. (Season Finale)
- "Redemption II" - Starfleet, led by Picard; works to expose Romulan meddling in the Klingon Civil War, as Gowron and Worf take on the House of
Duras. (Season Premiere)
- "Unification I" - To the Federation's surprise, Ambassador Spock has traveled to Romulus. Fearing he has defected, they send Captain Picard and
some of his officers on a covert mission to determine why.
- "Unification II" - On Romulus, Picard and Data meet with Spock, who claims to be trying to reunite the Romulans and Vulcans. While Spock works to
achieve his goal, powers within the Romulan government seek to pervert his mission into an invasion of the Federation.
- "New Ground" - Worf's son Alexander comes to live on the Enterprise; the crew helps guide a test vehicle for a revolutionary new form of
- "Ethics" - After Worf is paralyzed by a freak accident, his only hope may be a visiting doctor with questionable morals.
- "Cost of Living" - Lwaxana Troi is onboard the Enterprise to hold her wedding ceremony; she also takes an interest in Worf's son Alexander,
encouraging him to adopt her carefree ways.
- "Imaginary Friend" - As the Enterprise explores a nebula, a little girl's imaginary friend becomes terrifyingly real.
- "Rascals" - Captain Picard, Ensign Ro, Guinan, and Keiko O'Brien are turned into children by a transporter accident, but retain their adult
memories, resulting in different reactions from each. When rogue Ferengi hijack the Enterprise, the young crewmembers, along with Alexander, lead the
- "A Fistful of Datas" - After a computer malfunction, Worf, Alexander Rozhenko, and Deanna Troi are trapped in an Old Western holodeck program where
all the characters look like and have the same abilities as Data.
- "Aquiel" - La Forge falls in love with a woman accused of murder.
- "Birthright, Part I" - At Deep Space 9, Worf investigates reports that his father is still alive; an engineering accident causes Data to experience
a vision of Dr. Soong.
- "Birthright, Part II" - In the Romulan prison camp, Worf teaches the Klingon children about their culture.
- "The Chase" - Picard tries to finish his old archaeology teacher's monumental last mission: solving a puzzle that leads Humans, Romulans, Klingons
and Cardassians to the secret of life in this galaxy, revealing the origin of humanoid life.
- "Suspicions" - Dr. Crusher violates Starfleet regulations and medical ethics when she investigates the death of a Ferengi scientist.
- "Rightful Heir" - At the Klingon monastery on Boreth, Worf sees a very real vision of Kahless the Unforgettable.
- "Gambit, Part II" - Picard and Riker try to find out what the pirates want while the Enterprise pursues them.
- "Firstborn" - A mysterious family friend encourages Worf's son Alexander to become a warrior.
- "Past Prologue" - A Bajoran terrorist tests Kira's loyalties to the Federation when he attempts to rid Bajor of the Federation for good.
- "Dramatis Personae" - The crew becomes infected by a telepathic imprint of a culture that destroyed itself.
- "Invasive Procedures" - A desperate Trill tries to steal the Dax symbiont.
- "Melora" - An officer who normally lives in a low-gravity environment is temporarily assigned to the station; Dr. Bashir devises a cure that could
rid her of her chair forever.
- "Blood Oath" - Three old Klingon warriors reunite on Deep Space 9, seeking Curzon Dax, with whom they entered into a blood oath to one day exact
revenge on an enemy for killing one of the warrior's sons. Finding Jadzia as worthy a warrior as they felt Curzon to be, she joins the Klingons in
completing their vendetta.
- "Crossover" - An accident inside the wormhole sends Kira and Bashir into the "mirror universe," where Bajorans rule over their human slaves.
- "The House of Quark" - After Quark lies about killing a Klingon in his bar, the dead man's widow abducts Quark to the Klingon homeworld to marry
- "Visionary" - O'Brien makes repeated jumps through time; a Romulan delegation visits the station.
- "Through the Looking Glass" - In the "mirror universe," Sisko must persuade the alternate version of his dead wife to join the Terran Rebels, or he
will watch her die a second time.
- "The Way of the Warrior" - When a Klingon fleet under General Martok arrives at the station to protect the Alpha Quadrant from the Dominion, Sisko
recruits Lt. Commander Worf to discover the Klingons' real intentions. (Season Premiere)
- "The Sword of Kahless" - Klingon Dahar Master Kor, Jadzia Dax, and Worf search for the fabled Sword of Kahless on a remote planet in the Gamma
- "Return to Grace" - Kira and Gul Dukat chase the Klingon Bird-of-Prey that destroyed a Cardassian outpost where Cardassian and Bajoran
representatives were holding a conference.
- "Sons of Mogh" - Worf's brother Kurn arrives on the station, and asks Worf to kill him.
- "Rules of Engagement" - The Klingons try to extradite Worf after he accidentally destroys a transport full of Klingon civilians.
- "Shattered Mirror" - Professor Jennifer Sisko uses Jake to lure Sisko to the "mirror universe" to help the rebels build another starship Defiant.
- "Broken Link" - Odo is plagued by an unknown ailment that threatens to kill him. Meanwhile, the Federation and the Klingon Empire move closer to
war. (Season Finale)
- "Apocalypse Rising" - Sisko leads a commando team into Klingon headquarters in an attempt to expose the Changeling impersonating Gowron. (Season
- "Looking for par'Mach in All the Wrong Places" - Worf helps Quark woo Grilka, his Klingon ex-wife.
- "Nor the Battle to the Strong" - After diverting to the Federation hospital on Ajilon Prime looking for an interesting story, Jake believes himself
to be a coward when repeated Klingon attacks awaken him to the reality of war and force him to abandon Dr. Bashir and run for cover.
- "Trials and Tribble-ations" - When Temporal Investigations arrives on Deep Space 9, Sisko recounts how he and the crew of the Defiant traveled back
in time to the 23rd century to prevent the assassination of Captain James T. Kirk during the original Enterprise's mission to Space Station K-7.
- "In Purgatory's Shadow" - Garak and Worf investigate a message which suggests that Cardassian spymaster Enabran Tain is still alive. Upon their
arrival, not only do they find Tain, but also General Martok
and someone they did not expect. (Part 1 of 2)
- "By Inferno's Light" - The crew tries to defend the Alpha Quadrant from the invading Dominion fleet; Worf, Garak, and the other prisoners prepare
to escape from the Dominion Internment Camp. (Part 2 of 2)
- "Soldiers of the Empire" - After Worf becomes first officer of a Klingon Bird-of-Prey commanded by General Martok, he is caught between loyalty to
his commander and loyalty to the crew.
- "Children of Time" - Investigating a planet surrounded by a powerful energy field, the crew of the Defiant discovers their own descendants, and
learns that in two days they will crash two hundred years in the past.
- "Sons and Daughters" - Alexander Rozhenko joins the crew of the Rotarran, much to the disappointment of Worf. On Terok Nor, Tora Ziyal returns to
the station where Dukat intends to use her to get closer to Major Kira.
- "Sacrifice of Angels" - Following a bloody battle to retake Deep Space 9 from the Dominion, and with the minefield destroyed, Sisko has no choice
but to ultimately take the Defiant into the wormhole and confront a fleet of Jem'Hadar ships alone.
- "You Are Cordially Invited" - The matriarch of the House of Martok challenges Worf and Dax's marriage.
- "In the Pale Moonlight" - Sick of the losses the Federation is taking in the war, Sisko enlists Garak's help to persuade the Romulans to join the
Federation against the Dominion. Sisko soon learns that, to save the Federation, he must abandon the values it stands for.
- "His Way" - Odo consults a holographic lounge singer about his relationship with Kira.
- "The Reckoning" - The discovery of a 30,000 year old Bajoran tablet buried under the holy city of B'hala announces the Reckoning, the time when the
future of Bajor will be decided.
- "Image in the Sand" - Sisko tries to regain contact with the Prophets. (Part One of Two) (Season Premiere)
- "Shadows and Symbols" - Sisko searches for the mysterious Orb of the Emissary; Worf, Martok, Bashir, O'Brien, and Quark attack a Dominion shipyard
in orbit around Monac IV; Kira confronts the Romulans over their military base. (Part Two of Two)
- "Once More Unto the Breach" - With the Dominion War raging, the old Klingon warrior Kor feels left out of the action, and looks for some way to get
his share of the honor of battle. However, his efforts to play a part are stymied by Martok, who holds a grudge with Kor.
- "The Emperor's New Cloak" - Grand Nagus Zek is kidnapped by the Klingon-Cardassian Alliance while on a business trip into the "mirror universe."
- "Chimera" - Odo meets another of the hundred Changelings who were sent out to explore the galaxy.
- "When It Rains..." - Sisko and Kira aid Damar's rebellion against the Dominion; Bashir discovers that Odo is infected with the disease that is
threatening the Founders. (Part 5 of 9)
- "Tacking Into the Wind" - Gowron begins reckless attacks against the Dominion; Kira and the Cardassians plot to steal a Breen weapon. (Part 6 of 9)
- "The Dogs of War" - Kira, Damar, and Garak are ambushed on Cardassia; Quark receives a message from Grand Nagus Zek appointing him the next leader
of the Ferengi Alliance. (Part 8 of 9)
- "What You Leave Behind" - In this final adventure, the Federation Alliance prepares a final invasion of Cardassia. Meanwhile on Bajor, Kai Winn
releases the Pah-wraiths from the Fire Caves which threatens the safety of not only Bajor, but the entire Alpha Quadrant. (Part 9 of 9, Series Finale)
- "Flashback" - When Tuvok begins to suffer from a mental breakdown, triggered by a suppressed memory, a mind-meld with Janeway takes him back to his
tour of duty with Captain Sulu aboard the USS Excelsior.
- "Real Life" - The Doctor learns a few real life lessons with the holographic "family" he created; Voyager investigates massive subspace
- "The Killing Game" - In an attempt to find new ways to satisfy their predatory instincts, the Hirogen erase the memories of the Voyager crew and
force them into violent holodeck simulations.
- "The Killing Game, Part II" - With half the Voyager crew trapped in a deadly simulation staged by the Hirogen, Captain Janeway must find a way to
retake the ship.
- "Infinite Regress" - The discovery of a Borg vinculum causes Seven to develop a multiple personality disorder.
- "Barge of the Dead" - B'Elanna Torres dies in a shuttle accident, and finds herself headed for Gre'thor, the afterlife for dishonored Klingons.
- "Unimatrix Zero, Part II" - Assimilated by the Borg, Janeway, Torres, and Tuvok plot to release a virus into the Borg Collective which will allow
members of Unimatrix Zero to retain their individuality in the real world and resist the Borg Queen. (Season Premiere)
- "Lineage" - Torres discovers that she is pregnant, and faces a private fear that she has had to deal with since her childhood.
- "Prophecy" - Voyager encounters a Klingon warship populated by the descendants of explorers who left the Beta Quadrant decades ago and believe
that the Federation and the Klingon Empire are still bitter enemies.
- "Endgame" - Years after Voyager's return to the Alpha Quadrant, Admiral Kathryn Janeway resolves to alter the past in order to help her crew get
home sooner. (Series Finale)
- Star Trek: The Motion Picture - After an eighteen-month refit process, the Starship Enterprise is ready to explore the galaxy once again. But when
a huge, invincible cloud approaches Earth, Admiral James T. Kirk must assume command of his old ship in order to stop it. Crewmembers old and new face new
challenges, and must work together to triumph over the unknown.
- Star Trek III: The Search for Spock - Admiral James T. Kirk, finding out he made a mistake by leaving Spock on the Genesis planet, must disobey
orders and hijack the hobbled Enterprise to retrieve his best friend. However, a rogue Klingon seeking the secrets of the "Genesis torpedo" puts Kirk's
mission as well as the Enterprise, its crew, and Spock himself in jeopardy.
- Star Trek IV: The Voyage Home - Admiral James T. Kirk is prepared to take the consequences for rescuing Spock and losing the starship Enterprise,
but a new danger has put Earth itself in jeopardy. Kirk and his crew must travel back in time in an old Klingon Bird-of-Prey to right an ancient wrong, in
hopes of saving Earth and the Federation from certain doom.
- Star Trek V: The Final Frontier - A distress call to a broken, impoverished world brings Captain James T. Kirk and the malfunctioning Starship
Enterprise-A face-to-face with Sybok, the half-brother of Spock. Having rejected logic, Sybok seeks to use the Enterprise-A to travel to the center of the
galaxy on a quest for the mythical planet Sha-Ka-Ree, in hopes of finding God. Beliefs are called into question as Kirk, Spock and McCoy must put an end to
- Star Trek VI: The Undiscovered Country - An interstellar cataclysm cripples the Klingon Empire's homeworld, leading to their Chancellor seeking
peace with the Federation. But covert acts attempt to thwart the peace process and, instead, plunge the Federation into interstellar war with the
Starship Enterprise-A and Captain James T. Kirk caught in the middle. Kirk must clear his name and overcome old prejudices to ensure that the chance for a
new era of peace between the Federation and the Klingon Empire does not go to waste.
- Star Trek Generations - An old mad scientist, the El-Aurian Dr. Tolian Soran, is seeking eternal happiness for himself, and wreaking interstellar
catastrophe in the process. Captain Jean-Luc Picard of the Starship Enterprise-D must stop him, regardless of the sacrifices that are necessary. But, he
finds an unexpected ally from the past as the same objective that drives Soran's madness also bridges two generations of Federation captains, uniting them
for a singular cause.