Kor, a revered Klingon warrior, enlists the aid of Worf and Dax on a search for the legendary Sword of Kahless, with the hope it will unite the Klingon Empire. Sisko loans the trio a runabout for their journey into the Gamma Quadrant, where the sword is believed to be. During their quest, they are attacked by an old enemy of Worf's—Toral, the son of Duras. Toral also seeks the legendary sword, and the group must determine if the sword will further divide the Klingon Empire.

John Colicos (Commander Kor)
Rick Pasqualone (Toral, son of Duras)
Tom Morga (Soto, the Lethean)

• Kor also appeared in the DS9 episode "Blood Oath".
  
• Toral was introduced in the Next Generation episode "Redemption, Part I".