In season five, Starfleet becomes involved in a vast conspiracy amidst a Klingon civil war which forces the Enterprise to become an unwilling pawn against the Romulans as Starfleet's motives are unknown. This leads Picard and Data to undertake a journey to seek out a mysterious member who is trying to make peace between the Romulans and the Vulcans. Meanwhile, a visitor from the future arrives on the Enterprise as Wolf struggles with his own handicap. The crew becomes even more conflicted as an injured enemy arrives. Peace is seen on the horizon but at what cost?
Stardate: 45020.4 - Picard suspects a Romulan influence in the recent Klingon civil war, and must force the Federation to intervene before the Empire collapses.
Stardate: 45047.2 - Picard must find a way to communicate with the newly discovered Tamarians, who speak entirely in metaphors, when a Tamarian Captain is brutally killed.
Stardate: 45076.3 - Picard exposes a planned genocidal attack on the Bajorans with the help of a new officer, Ensign Ro Laren.
Stardate: 45122.3 - Picard attempts communications with the Crystalline Entity - a life form responsible for hundreds of deaths throughout the Alpha Quadrant. However, a scientist on board the Enterprise has plans of revenge over the death of her only son at the hands of the Entity.
Stardate: 45156.1 - A natural disaster leaves Troi in command of the Enterprise, Picard stuck in a turbo lift with three small children and Keiko O'Brien stuck in Ten-Forward giving birth with an anxious Worf.
Stardate: 45208.2 - An addictive game is distributed among the crew of the Enterprise, however, it appears that this game interferes with a person's logic and reason, which leaves the crew open to manipulation. Only a young Ensign and a vacationing Wesley Crusher are able to think for themselves, and must find a way to reverse the damage before the ship falls into the wrong hands.
Ambassador Spock has disappeared and intelligence finds him on Romulus. Captain Picard is sent to Romulus to find Spock. Meanwhile, Riker and the rest of the crew investigate the fragments of a Vulcan ship discovered in the wreck of a Ferengi vessel.
Stardate: 45245.8 - Picard and Data find Spock and discover the reason behind the secret meetings. However, a darker scheme planned by the Romulans is also uncovered in the process.
Stardate: 45349.1 - While on a mission to help a planet recently struck by an asteroid, the Enterprise is payed a visit by a man who claims to be from the future.
Stardate: 45376.3 - Worf's son, Alexander, unexpectedly arrives on the Enterprise to stay with his father. However, Alexander wants to stay permanently.
Stardate: 45397.3 - The Enterprise investigates the cause of an explosion which destroyed a small ship and its entire crew, except for a small boy.
Stardate: 45419.3 - While escorting a group of telepaths, crew members on board the Enterprise suddenly start to slip into comas.
Stardate: 45470.1 - A natural disaster in the core of a system's sun threatens to destroy a colony of genetically engineered people on an otherwise desolate planet. However, the crew's intervention may cause more harm than good.
Stardate: 45494.2 - The Enterprise crew unknowingly receives a new first officer who claims that the Federation is at war with another species.
Stardate: 45571.2 - While en route to the source of a subspace distress signal coming from a desolate moon, Data, Troi and O'Brien take over the bridge and force the ship to change course.
Stardate: 45587.3 - When Worf is paralysed in an accident he must undergo drastic back surgery. However, this experimental technique may cost him his life.
Stardate: 45614.6 - While investigating the disappearance of a J'naii shuttlecraft, the crew finds reason to believe the missing ship is stranded in an abnormal pocket called "null space." Riker and Soren, a member of the J'naii race, begin preparing to rescue the craft, and the two strike up a friendship. Their relationship develops quickly as the pair question each other about mating habits, since the J'naii are androgynous and do not identify themselves as either male or female. Despite this difference, sparks begin to fly between them.
Stardate: 45652.1 - While exploring the Typhon Expanse, the Enterprise is caught in a time warp in which they are repeatedly destroyed while colliding with another starship.
Stardate: 45703.9 - Wesley is involved in a cover-up at Starfleet Academy when a cadet is killed and five shuttles are destroyed during a forbidden maneuver performed by Starfleet Academy's best cadets.
Stardate: 45733.63 - Deanna's mother pays a surprise visit to the Enterprise with even more surprising news: she plans to marry a man she has never met. After destroying an asteroid, the ship becomes infected with parasites that eat away at the ship's hull.
Stardate: 45761.3 - The Ferengi try to abduct an empathic Metamorph who could bring peace between two warring worlds.
Stardate: 45832.1 - While exploring a strange form of energy in a region of space, a little girl's imaginary friend becomes real and places the Enterprise in great danger.
Stardate: 45832.1 - An injured Borg is discovered and brought back to the Enterprise where he is 'repaired' by Dr. Crusher and befriended by Geordi, who names him 'Hugh.' Soon, Hugh starts showing signs of individuality while Picard must choose between destroying him or returning him to the collective.
Stardate: 45092.4 - While the Enterprise helps a Romulan science vessel, an accident occurs which forces Geordi LaForge and Ro Laren slightly out of 'phase', causing them to become undetectable to everyone but each other. As a result, the crew thinks they are dead and make arrangements for their funerals, even though they are closer than the crew realise.
Picard is struck by an energy beam from an alien probe, which renders him unconscious and places him in the life of a citizen on the planet Kataan, with his memory of the Enterprise intact. Although he searches for a way to return, he finally decides to live his life with his Kataan wife, have children & grandchildren, learning to play a flute and completely immersing in the Kataan culture. He finds the planet is dying due to an imbalance of its sun. With no way to evacuate the planet's people, the government builds a probe which will tell others how they lived. The same probe that Picard met. Picard wakes to find himself back on the Enterprise having lived an entire lifetime in just minutes. The probe, having disgorged its memories, gives one last gift: the flute (which shows up in later episodes.)
Stardate: 45959.1 - Data's head is uncovered in an archaeological dig on Earth, where evidence is also found that aliens may have been on Earth as early as the 19th Century. Using modified technology, an away team follows Data into the late 1890s to investigate.