Title: Datalore
Original Air Date: January 18, 1988
Teleplay by: Robert Lewin and Gene Roddenberry
Story by: Robert Lewin and Maurice Hurley
Directed by: Rob Bowman
Episode: S01E013
Stardate: 41242.4

Synopsis: After dropping off a bunch of Human Horn for Lurr in the Omicron Persei system, the Enterprise cruises into the nearby Omicron Theta system, to pay a visit to Data's home planet.

Omicon Theta was once a farming colony, but all the colonists -- and everything they once grew -- were all gone when Data was found. Oh! A mystery! Riker leads an away team to the planet's surface in an effort to solve it. (In a scene that was cut from the final episode, the USS Mystery Machine showed up, and captain Fred said, "Dang." before it flew away to the Scary Old Amusement Park galaxy.)

They make their way to the exact spot where Data was discovered: it's sort of a hollowed out area beneath a bunch of rocks, where Data tells them he was found wearing nothing more than a layer of dust. Before anyone can make a saucy reference about 'The Naked Now' to Tasha, Geordi's Visor reveals that the rocks aren't naturally hollow, and the "wall" opens up, revealing a twisty maze of passages, all alike.