Read more about The Planet Killer at: Wikipedia

Official Site: Paramount Pictures

"The Doomsday Machine" is a second-season episode of the science fiction television series Star Trek. It is episode #35, production #35, and was first broadcast on October 20, 1967 and repeated on April 19, 1968. It was written by Norman Spinrad, and directed by Marc Daniels.

In this episode, the starship Enterprise and its heavily-damaged sister ship, the USS Constellation, must work together to stop an alien planet-killing machine headed for the heart of Federation territory.

On stardate 4202.9, following a trail of destroyed solar systems, the Federation starship USS Enterprise responds to a distress call, finding their sister ship, the USS Constellation, adrift and heavily damaged in a system whose two inner planets are still intact. Captain Kirk beams over to the Constellation with Chief Medical Officer Dr. McCoy, Chief Engineer Scott and a damage control team to investigate. There they find the ship's commanding officer, Commodore Matt Decker, half-conscious in the auxiliary control room – the sole survivor. Mr. Scott reports that the ship's warp engines are damaged beyond repair and the weapons exhausted. Meanwhile, an incoherent Decker can only mutter about something attacking his ship as McCoy treats him.

The logs reveal that the ship investigated the breakup of a planet and was soon attacked by an enormous machine with a conical shell miles in length and a giant opening at one end filled with sparkling energy. After the attack, Decker ordered his surviving crew to the surface of a nearby planet, but to his horror, the machine destroyed that world next. Spock theorizes the machine breaks down planets into rubble which it then consumes for fuel and adds that given its past trajectory, it is likely to have come from outside the galaxy and will continue towards the "most densely populated region of our galaxy."

The Planet Killer has not been a contender in any CBUB matches.