For the 42 Challenge
Season 1, Episode #22 (Production Code: 122)
First aired: 4/25/1988; 1 hour
Directed by: Joseph Scanlan; Written by: Joseph Stefano, Hannah Louise Shearer
When Troi's shuttle crashes on an alien planet, a new being is discovered: Armus, an entity that thrives on the suffering of others. The rescue attempt results in the death of Lt. Tasha Yar.