Datalore

On Data's home planet, the Enterprise crew find a disassembled android, Lore, and rebuild him. Lore drugs Data, impersonates him and calls a crystalline entity to the ship to feed on its life. Data and Wesley stop him and beam him away, and the entity leaves.

• Leads to Brothers (S04E03): Lore, sent into space at the end of Datalore, drifts for nearly two years before their creator Soong reactivates him.
• Leads to Silicon Avatar (S05E04): The Crystalline Entity that Lore called to the Enterprise in Datalore is tracked and destroyed by Marr.
• Leads to Descent, part 2 (S07E01): Lore, introduced in Datalore, returns calling Data brother and takes control of him.

Captain's log, stardate 41242.4. Our last assignment has taken us into the remote Omicron Theta star system, home of our android crewmember Lieutenant Commander Data. Although we are due at our next assignment, I have decided to visit Data's home planet for a few hours in the hopes of unravelling some of the mystery of his beginnings.

First Officer's log, stardate 4124.5. We have found Data's home to be a completely dead world made out of lifeless vegetation. No insects, not even soil bacteria. What is it that could kill everything on an entire planet?

Captain's log, Stardate 41242.45. Despite having only a few hours in which to explore Data's home planet we've discovered something which may explain Data's beginnings, if we can properly assemble and communicate with what we've found.

Captain's log, stardate 41242.5. Thanks to Lore's report, we now know what happened to the colonists. Beginning with a child's drawing, enhanced by Lore's description, our computer has constructed the image of a great crystalline entity which feeds on life, insatiably ravenous for the life force found in living forms, capable of stripping all life from an entire world.

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

Starring

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

Also starring

• LeVar Burton as Lt. Geordi La Forge (Lieutenant Commander Geordi La Forge)
• Denise Crosby as Lt. Tasha Yar (Lieutenant Natasha 'Tasha' Yar)
• Michael Dorn as Lt. Worf (Lieutenant Worf)
• Gates McFadden as Doctor Beverly Crusher (Dr Beverly Crusher)
• Brent Spiner as Lt. Commander Data (Lieutenant Commander Data)
• Wil Wheaton as Wesley Crusher (Wesley Crusher)

Guest star

• Biff Yeager as Argyle (Lieutenant Commander Argyle)

Uncredited co-stars

• James G. Becker as Youngblood
• Darrell Burris, Dan Campise, Dexter Clay as operations officer (3 performers)
• Jeffrey Deacon as command officer
• Lorine Mendell as Diana Giddings
• Brent Spiner as Lore (Lore)
• Guy Vardaman as Darien Wallace