Skin Of Evil

On Vagra II, the oil-like Armus kills Tasha Yar for amusement and holds Troi and Lieutenant Prieto in their crashed shuttle, also seizing Riker. Picard refuses to bargain, Armus's guard drops, and Troi and Prieto are beamed up. Tasha is mourned in a holodeck farewell.

• Leads to Yesterday's Enterprise (S03E15): The alternate timeline undoes Tasha's pointless death and gives her a meaningful one.
• Leads to Legacy (S04E06): Tasha's sister Ishara appears, and Data tells her Tasha was killed on Vagra Two.

Captain's log, stardate 41601.3. We are crossing through the Zed Lapis sector, where we will rendezvous with shuttlecraft thirteen, carrying Deanna Troi, who is returning from a conference. Because Engineering is involved in preventive maintenance on our dilithium crystals, we are presently travelling on impulse power.

Captain's log, supplemental. We've lost all contact with shuttlecraft thirteen, and can only assume they've crash-landed on Vagra Two. Meanwhile, main Engineering is trying to return us to warp power.

Captain's log, supplemental. While on a mission to rescue survivors from an unexplained shuttle crash, the away team has encountered a strange creature which seems able to assume different forms, including one which resembles humanoid.

Captain's log, supplemental. There is grave danger to the crew on Vagra Two. My first officer is missing, attacked by this entity known as Armus.

Captain's log, stardate 41602.1. The shuttlecraft has been destroyed to prevent any possibility of Armus leaving the planet. Vagra Two will be declared off limits. But the damage has been done. One of the saddest duties I've ever had to perform is now ahead of me.

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 / Natasha Yar (hologram) (Lieutenant Natasha 'Tasha' Yar)
• Michael Dorn as Lt. Worf (Lieutenant Worf)
• Gates McFadden as Doctor Beverly Crusher (Dr Beverly Crusher)
• Marina Sirtis as Counselor Deanna Troi (Counselor Deanna Troi)
• Brent Spiner as Lt. Commander Data (Lieutenant Commander Data)
• Wil Wheaton as Wesley Crusher (Wesley Crusher)

Guest star

• Mart McChesney as Armus (Armus)

Co-stars

• Ron Gans as Voice of Armus (Armus)
• Walker Boone as Leland T. Lynch
• Brad Zerbst as Nurse
• Raymond Forchion as Ben Prieto

Uncredited co-stars

• Majel Barrett as Computer Voice
• Terrence Beasor as Alien voices
• James G. Becker as Youngblood
• Juliet Cesario as operations division officer
• Dexter Clay as operations division officer
• Tim McCormack as Bennett
• Burt Nacke as operations division technician
• Steve Reed as Enterprise -D science officer
• Guy Vardaman as Darien Wallace