Brothers

Data hijacks the Enterprise, answering a homing signal from his creator Dr Soong, who is dying and wants to give him an emotion chip. Lore, also summoned, impersonates Data, takes the chip and escapes, leaving Soong alive.

• Follows Datalore (S01E13): Lore, sent into space at the end of Datalore, drifts for nearly two years before their creator Soong reactivates him.
• Leads to Descent, part 2 (S07E01): Lore uses the emotion chip he took in Brothers to control Data.
• Referenced by Descent, part 1 (S06E26): Lore, last seen in Brothers, reappears in Descent and stands with Data: 'The sons of Soong have joined together.'
• Referenced by Inheritance (S07E10): Data and La Forge recall the emotion chip from Brothers when Juliana, who says she was Soong's wife, appears.

Captain's log, Stardate 44085.7. Due to a medical emergency, we have been forced to cut short a two day liberty on Ogus Two and set course for Starbase four one six. It seems a young man's practical joke has come dangerously close to a lethal conclusion.

Captain's log, Stardate 44091.1. We have been at Starbase four one six for three days. Young Willie Potts is responding well to treatment and has been returned to the Enterprise.

From Memory Alpha. Linked where the credit could be matched to a transcript label.

Starring

• Patrick Stewart as Capt. Jean-Luc Picard (Captain Jean-Luc Picard)
• Jonathan Frakes as Cmdr. William Riker (Commander William T. Riker)

Also starring

• LeVar Burton as Lt. Cmdr. Geordi La Forge (Lieutenant Commander Geordi La Forge)
• Michael Dorn as Lieutenant Worf (Lieutenant Worf)
• Gates McFadden as Dr. Beverly Crusher (Dr Beverly Crusher)
• Marina Sirtis as Counselor Deanna Troi (Counselor Deanna Troi)
• Brent Spiner as Lt. Commander Data (Lieutenant Commander Data)
• Wil Wheaton as Ensign Wesley Crusher (Wesley Crusher)

Guest stars

• Cory Danziger as Jake Potts (Jake Potts)
• Colm Meaney as Miles O'Brien (Chief Miles O'Brien)

Co-starring

• Adam Ryen as Willie
• James Lashly as Ensign Kopf
• Brent Spiner as Lore / Dr. Soong (Lore)

Uncredited co-stars

• Rachen Assapiomonwait as Nelson
• Majel Barrett as Enterprise computer voice
• Joe Baumann as Garvey
• Karin Baxter, Gerard David, Elliot Durant III, Noriko Suzuki as operations division ensign (4 performers)
• Michael Braveheart as Martinez
• Debbie David as Russell
• George Colucci as security officer
• Jeremy Doyle as operations ensign
• Margaret Flores, Mark Lentry, Harry Young as science division officer (3 performers)
• Carrie Henger as a security officer
• Jerry Spicer as security officer
• Karen Uchizono as command officer