A misguided prank between two young brothers exposes the younger of them to a toxic parasite that cannot be treated aboard the USS Enterprise, but Dr. Crusher (Gates McFadden) is able to stabilize his condition in a controlled environment in sickbay while the ship sets out for a starbase that can cure the boy.
Captain Picard (Patrick Stewart) orders Geordi La Forge (LeVar Burton) to transfer the controls to Engineering while the rest of the bridge crew evacuates, but Data instead remains on the Bridge, mimics Picard's voice and locks down control of the ship with a complex access code, preventing any interference with his actions.
Lore expresses resentment towards his creator and starts to leave, but stops when Soong tells both of his creations that he is dying and wishes to give Data an "emotion chip" he has created.
After Data is reactivated, he cannot recall any of what he did on the Enterprise to arrive at this planet, until Soong reveals to him where he can find that information stored in his memory files.
After Soong states that he wishes to die on the planet, the Enterprise leaves and returns to its course to the medical facility, where the sick boy is successfully treated.
[7] "Brothers" was released in the United States on September 3, 2002, as part of the Star Trek: The Next Generation season four DVD box set.