"Do not go Gentle" - After a ship malfunction knocks everyone out, Enterprise enters a region of space where a disembodied, malevolent voice claims to be Death and taunts the ship, menacing the crew. Weapons are ineffective. Death claims the crew's time has come. Death then chooses crew members to battle him in single combat across the ship, disposing with them easily. Finally, Kirk offers himself up, saying if he wins, the ship and crew left can leave. What follows are a series of fights with different weapons and locations in history. Meanwhile, McCoy is left with Kirk's dying body, valiantly fighting to save his life.
Next episode: "The Guardian"