Existence itself comes under threat from a man's power-struggle with his alternate self, with the Enterprise's strained dilithium crystals presenting his key to a final solution.
Episode rating
Cast of episode
- Captain James Tiberius 'Jim' Kirk
- Mister Spock
- Lazarus
- Dr. McCoy
- Charlene Masters
- Uhura
- Admiral Fitzgerald
- Assistant Engineer
- Transporter Chief
- Lieutenant Leslie
- Lieutenant Hadley
- Security Guard
- Anti-Matter Lazarus Being #2
- Lt. Brent
- Enterprise crewmember
- Security Guard
- Crewman
- Anti-Matter Lazarus Being #1