Star Trek: Insurrection

Lieutenant Commander Data's unusual behavior on a mission to observe the peaceful Ba'ku race raises concerns. The Ba'ku, who live on a planet with regenerative radiation, have incredible lifespans and reject advanced technology. Their planet and culture are secretly researched by the Federation and an alien race, the Son'a, who plan to abduct the Ba'ku to take the planet for themselves and for Starfleet officials seeking to regenerate their bodies.