Jadzia Dax risks her life and her future with Starfleet to fulfill a blood oath Curzon Dax made with three aged Klingons.

John Colicos (Commander Kor)
Michael Ansara (Commander Kang)
William Campbell (Koloth)
Bill Bolender (The Albino)
Christopher Collins (The Assistant)

• All three Klingons appeared in different original Star Trek episodes.
  
• Commander Kang also appeared in Star Trek IV: The Undiscovered Country and in the Voyager episode "Flashback".
  
• John Colicos also played Baltar on Battlestar Galactica.
  
• Kor is at least 100 years old; Koloth is at least 150.
  
• Curzon Dax is the godfather of Kang's son, who was named Dax in his honor.
  
• Kor will return in the fourth season episode "The Sword of Kahless".