The Enterprise is caught in the middle when two alien worlds wage a bitter battle over a shipment of felicium, a narcotic drug grown only on Brekka, which is a "cure" for the "plague" on Ornara.

Merritt Buttrick (T'Jon)
Judson Scott (Sobi)
Richard Lineback (Romas)

Kimberly Farr (Langor)

• Merritt Buttrick and Judson Scott both appeared in Star Trek II: The Wrath of Khan. Merritt Buttrick died soon after appearing in this episode. (Judson Scott was not given credit for his role in Star Trek II because he demanded billing with the main stars or none at all. He got none at all.)
  
• That "Just Say No" dialog between Tasha and Wesley... Ugh....
  
• This was the last episode that Denise Crosby shot. At the end of the episode when Dr. Crusher and Capt. Picard exit the cargo bay, you can see Lt. Yar waving goodbye in the background. This episode was filmed after "Skin of Evil" (Episode 23), but originally aired before.