In "Redemption," Riker and the crew must risk sacrificing Picard in order to save Earth from enslavement by the Borg. "Family" sees the crew members reunite with their relations and loved ones while the U.S.S. Enterprise undergoes repair, and "Brothers" finds Data in an unexpected encounter with his evil brother, Lore. In "Suddenly Human," Picard is faced with a difficult decision to involving a human boy who appears to have been abused by his alien father .
In "Remember Me," Wesley's experiments with a warp field go awry and catapult Dr. Crusher into a universe created by her own mind, while in "Legacy," a rescue mission leads the crew to the home planet of their late comrade, Tasha Yar, where they encounter her mysterious sister. "Reunion" sees Worf reunited with his former mate and their son while Picard mediates over a power struggle between potential successors to the Klingon Empire. "Future Imperfect" sees Riker awakening in Sickbay to find that he has been unconscious for 16 years.
In "Final Mission," Wesley is invited by Captain Picard to accompany him on one last expedition before entering Starfleet Academy. "The Loss" sees Troi inexplicably losing her empathetic powers, while in "Data's Day" a friend's forthcoming wedding compounds his confusion about human feelings. In "The Wounded" Picard and the crew must stop a renegade Federation starship from making unprovoked attacks on a former enemy's ships.
In "Devils Due," Picard fights to save a terrorised planet from a powerful woman claiming to be the Devil, while in "Clues" the crew are shocked to discover Data has been lying to them. "First Contact" sees Commander Riker critically injured and stranded on a developing Planet while "Galaxy's Child" finds Geordi escorting the woman of his dreams aboard the U.S.S. Enterpise.
In "Night Terrors," the crew are plagued by unexplained hallucinations and panic which threatens to destroy them all, while "Identity Crisis" finds Dr. Crusher racing against time to fight a parasite that threatens to transform Geordi into an alien creature. In "The Nth Degree" a crew member is , endowed with super human intelligence by an alien probe which threatens the fate of all on board the ship and in "QPid" Picard's reunion with an old flame is complicated when the mischievous Q intercedes to encourage the romance.
In "The Drumhead," a retired Starfleet Admiral begins a witch hunt for a traitor aboard the U.S.S. Enterprise, while "Half a Life" sees Troi's mother fight to stop her lover from participating in the ritual suicide dictated by his society. "The Host" finds Dr. Crusher's love put to the test when she falls for an alien. In "The Minds Eye" Geordi is kidnapped by Romulan forces and transformed into a killing machine through mind control.
"In Theory" finds Data experimenting with falling in love, while "Redemption Part 1 " finds Worf's loyalties torn between the Federation and his people as a civil war threatens the Klingon Empire.
Special Features: (info)
Mission Overview: discussions with the cast and crew on season four, including interviews with the newest cast members
Selected Crew Analysis - year four: this feature takes a look at the growth of the main characters during the series
Departmental Briefing - year four: a behind the scenes look at the production of the key episodes in series four, including in depth interviews with production crew
Departmental Briefing - new life and new civilisations: includes background information on some of the more unusual characters and situations the crew and cast are faced with.
Chronicles from the final frontier - specific anecdotes about episodes and events during filming of the fourth season