Lieutenant Commander Data (Star Trek) (Brent Spiner) is temporarily transferred to an undercover mission observing the peaceful List of Star Trek races#Ba'ku people. While on their planet, he malfunctions and reveals the presence of the joint United Federation of Planets–Son'a task force observing the Ba'ku. Admiral Matthew Dougherty (Anthony Zerbe) contacts the USS Enterprise (NCC-1701-E) to obtain Data's schematics but adamantly states the presence of the ''Enterprise'' is not needed. Captain Picard decides to ignore these orders and takes the ''Enterprise'' to capture Data. After stopping Data, Captain Jean-Luc Picard (Patrick Stewart) becomes suspicious of Dougherty's insistence that the ''Enterprise'' is no longer needed. His crew investigates the cause of Data's malfunction. They discover that the Ba'ku have advanced technology, but have rejected its use to live simpler lives. Due to unique radiation or "metaphasic particles" emanating from their planet's rings, they are effectively immortal. Dougherty's allies, the Son'a, are a decrepit race who use medical techniques to prevent death; their excessive use of Rhytidectomy gives them a mummified appearance. The ''Enterprise'' crew also begin to experience the rejuvenation effects of the planet: Lt. Commander Geordi La Forge (LeVar Burton) finds his eyes have regenerated and he no longer requires ocular implants; Commander William Riker (Jonathan Frakes) and Counselor Deanna Troi (Marina Sirtis) rekindle their long-abandoned relationship; and Picard develops a romantic relationship with the Ba'ku woman Anij (Donna Murphy).