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A mysterious recurring dream inspires Castle and Beckett to look for answers about Castle's two-month disappearance; their search for the truth turns dangerous.

Daniel tries to prevent a catastrophic accident on another planet and gets exposed to deadly radiation.

SG-1 finds a replicator-controlled world and explores its origins.

Anubis' forces lay siege to a planet after the Shades of Gray NID team disables its defenses; SG-1 works with the captives to restore the protection.

A Jaffa leader tries to rally his people against the Goa'uld, while seeking to forge an alliance with Earth.

SG-1 finds a replicator-controlled world and explores its origins.

Dutch and John are racing against time and a competing Killjoy in an attempt to clear their names and save D'avin's life.

Beckett and Castle are faced with a large list of possible suspects when a personal injury attorney known as Richie Falco is murdered; a shocking secret deepens the mystery surrounding Richie's death.

The 20th-century followers of a man named Khan (Ricardo Montalban) are found in suspended animation on the derelict ship Botany Bay.

To save his ship, Kirk intervenes in a 500-year-old, computerized war between neighboring worlds; guest Barbara Babcock.

The Enterprise crew falls under the spell of space spores on an agricultural colony world; guest Jill Ireland.

The Enterprise officers search for an elusive, rock-burrowing creature which is killing the miners of Janus 6.

With Sanctuary cut off from the outside world, Abigail has free rein to exact revenge by taking justice into her own hands; amidst mounting hysteria, Maggie must battle against the odds to avert catastrophe and ensure that justice is finally done.

Graffiti starts coming to life and threatening a teenage girl; the team must figure out how these strange events relate to Gregor's Hammer and Gregor's imminent return.

General Gregor retrieves the Sword of Mars and uses it to take over the country of Caucasylvia, gaining control of their nuclear arsenal; the team must steal the Sword to prevent world calamity.

Kirk cannot comprehend the apathy of the peaceful residents of Organia in the face of Klingon atrocities.

Identical men (Robert Brown in a dual role) from parallel universes will cause total annihilation if they meet.

With Sanctuary cut off from the outside world, Abigail has free rein to exact revenge by taking justice into her own hands; amidst mounting hysteria, Maggie must battle against the odds to avert catastrophe and ensure that justice is finally done.

Graffiti starts coming to life and threatening a teenage girl; the team must figure out how these strange events relate to Gregor's Hammer and Gregor's imminent return.

General Gregor retrieves the Sword of Mars and uses it to take over the country of Caucasylvia, gaining control of their nuclear arsenal; the team must steal the Sword to prevent world calamity.

The team is sent on a mission to try to prevent Asgard technology from falling into the clutches of the Goa'uld.

An off-world weapon transforms the Stargate into a doomsday device.

A desperate gambit to save Earth could destroy the Stargate.

When an air marshal is murdered on Alexis and Castle's flight to London, the father-daughter duo must find the killer before he can carry out his plan.

When Castle and Beckett investigate the death of the creator of a long-running sketch show, they discover a secret that could explain his murder.

A botched operation traps the team in an alien mothership at the bottom of the Pacific.

An off-world weapon transforms the Stargate into a doomsday device.

A desperate gambit to save Earth could destroy the Stargate.

The team is sent on a mission to try to prevent Asgard technology from falling into the clutches of the Goa'uld.

An off-world weapon transforms the Stargate into a doomsday device.

A vengeful warlord strands the Killjoys in a bombed-out, restricted city wasteland when a hostage exchange goes south.

When an air marshal is murdered on Alexis and Castle's flight to London, the father-daughter duo must find the killer before he can carry out his plan.

Worf takes responsibility for a boy when his mother, the ship's archaeologist, is killed on a mission.

The Enterprise experiences a rapid energy drain that leaves the crew vulnerable to radiation exposure; Geordi consults a hologram of the Enterprise's original designer seeking a solution.

A Romulan warship thwarts attempts to rescue Geordi, stranded on a planet swept by electrical storms.

Following the discovery of the galaxy's first stable wormhole, representatives from several cultures meet on the Enterprise to negotiate for passage rights; Troi falls for a handsome delegate who uses underhanded tactics in negotiations.

Picard offers to mediate a dispute between a peaceful society and a renegade clan that steals to live.

Someone is killing off potential Librarians, and it's up to Flynn Carsen and his new Guardian, Colonel Eve Baird, to save the three that are left.

The Serpent Brotherhood is trying to return magic to the world; Flynn, Colonel Baird, and the potential Librarians must stop them before it's too late.

The Enterprise crew members may be forced into war when a Romulan defector leads them to a showdown.

A prison escapee from a potential Federation member planet claims he is a soldier brainwashed by his government to kill.

A radical takes Crusher hostage to treat his injured comrades.

Someone is killing off potential Librarians, and it's up to Flynn Carsen and his new Guardian, Colonel Eve Baird, to save the three that are left.

The Serpent Brotherhood is trying to return magic to the world; Flynn, Colonel Baird, and the potential Librarians must stop them before it's too late.

The team struggles to survive in Antarctica with a young woman found in the ice.

Inhabitants of a sleepy seaside town harbor a dark secret.

O'Neill becomes the prisoner of a system lord, with no memory of how he got there.

An investigation into a death in the woods brings Castle back to a traumatic event from his childhood, leading to an obsessive search for answers; Beckett faces a crossroads.

A call from a mysterious stranger ignites an explosive chain of events; the story is told from Castle's perspective as he searches for Beckett.

Jonas (Corin Nemec) leads the team to his home planet in a bid to avert a war.

Inhabitants of a sleepy seaside town harbor a dark secret.

O'Neill becomes the prisoner of a system lord, with no memory of how he got there.

The team struggles to survive in Antarctica with a young woman found in the ice.

Inhabitants of a sleepy seaside town harbor a dark secret.

Dutch and John take on a warrant for a missing migrant worker on Leith; D'avin needs to pass a psych evaluation, but Pawter's assessment questions his mental fitness.

An investigation into a death in the woods brings Castle back to a traumatic event from his childhood, leading to an obsessive search for answers; Beckett faces a crossroads.

Picard's nemesis, Q, claiming to have lost his powers, appears on the Enterprise; some of Q's enemies arrive to take advantage of his vulnerable state.

A widow accuses Riker of seducing her and killing her husband, a respected scientist; the crew constructs a holodeck simulation to show the events from the perspectives of all the participants.

An Enterprise from the past breaks through a time rift, altering the course of history; Guinan is the only one that senses that the timeline has been altered.

When Data creates an android offspring, Starfleet wishes to separate the two androids, and an admiral arrives to remove her from his care.

Worf and his brother Kurn defend their family honor when the Klingon high council accuses their late father of treason.

The librarians' first solo mission hits a snag when Baird loses the others in a mysterious labyrinth that magically exists below the skyscraper of a modern corporation.

When the Serpent Brotherhood wants to kill Santa, the librarians must rescue him and help him accomplish the secret purpose of Christmas.