2.06 The Doomsday Machine

Investigating the destruction of several planetary systems, the Enterprise discovers a crippled starship floating in space. Commodore Decker is the only one left on the ship and is soon found to be less than sound-minded when he takes control of the Enterprise and exposes it to lethal danger.

The Doomsday Machine
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TOS Season 2, Episode 6

Norman Spinrad
Marc Daniels

First Aired Oct 20, 1967
Stardate 4202.9