The stakes are high when the Enterprise encounters an automated robotic weapon that is moving through the galaxy, destroying every planet that it encounters. The power of this Planet Killer is displayed by the fact that it has already severely damaged the USS Constellation, another Starship that is identical to the Enterprise.
The second season of the Original Series had a somewhat ropey start, but we’ve now had a second great episode in a row. “The Doomsday Machine” is hugely entertaining despite the fact that, if you think about it, not much actually happens. The Planet Killer is a daunting a threat but by itself is’t that interesting – it is just something of a Macguffin rather than a character in its own right with any motivation. Instead, the drama comes from inside the Enterprise and the presence of Commodore Matt Decker, the commanding officer of the Constellation and the last survivor after his mistakes have resulted in the death of his entire crew. Throughout its history, Star Trek often introduces senior officers as obstacles for respective captains to overcome, but Decker’s behaviour here makes perfect sense as he attempts to deal with what he has done. Indeed, Decker is said to be a friend of Kirk’s, which implies that he must have been an upstanding and rationale Starfleet officer before the events of the episode. However, Decker has now become a version of Captain Ahab from “Moby Dick”, obsessed with destroying the Planet Killer and prepared to put the Enterprise at risk in order to do so. With Kirk stuck on the Constellation, there are some great scenes as Decker pulls rank on Spock, who is powerless to stop him. McCoy is well used here as a means of presenting the emotion of the situation (I love the way that he manages to make adding “Sir” to one of speeches sound like an insult). When Kirk finally makes contact with the Enterprise again and realises what Decker is doing , we see probably his first act of real subordination as he is the one person prepared to stand up to Decker. Kirk’s anger at the commodore endangering his ship manages to be both satisfying and amusing.
William Windom's performance as Decker is great, making the commodore suitably restless in his body language and the way that he is constantly playing with some data bricks. It’s a role that gives plenty of scope for going over the top but Windom generally manages to avoid this; the closest he comes in his first scene and even there he seems subtle compared with William Shatner’s shouty line readings as he demand that Decker tell him what has happened. Despite Decker essentially being an antagonist for the first half of the episode, he is still ultimately a sympathetic character with his decision to sacrifice himself in an attempt to destroy the Planet Killer by flying a shuttlecraft in it. It is a nice inversion of the cliché that his actions aren’t actually successful, but he doesn’t die completely in vain as it gives Kirk the idea to create a bigger explosion using the Constellation. The climatic scenes as Kirk sets the Constellation for destruction but his attempts to escape are frustrated by inevitable problems with the transporter manage to be very tense even despite the fact that we all know that he will be fine.
No definitive explanation is given for the origin of the Planet Killer, other than the fact that It appears to come from another galaxy. Kirk theorises that it is a Doomsday Machine left over from an ancient war, but there is no evidence for this. His attempts to compare it the H-Bombs causing so much concern in the world when the episode was made are unusually clumsy for a show that doesn’t normally need to explain its metaphors. However, this is a very small problem in a script that manages to make so much from a very simple situation and which is satisfying in both its plot progression and character work.
The shuttlecraft that Decker steals is not named on screen but it appears to be the Galileo, resulting in the destruction of the shuttle featured in “The Galileo Seven” and “Metamorphosis”. This is problematic in terms of the order in which the episodes were originally transmitted since “Metamorphosis” was shown after “The Doomsday Machine”.
The second season of the Original Series had a somewhat ropey start, but we’ve now had a second great episode in a row. “The Doomsday Machine” is hugely entertaining despite the fact that, if you think about it, not much actually happens. The Planet Killer is a daunting a threat but by itself is’t that interesting – it is just something of a Macguffin rather than a character in its own right with any motivation. Instead, the drama comes from inside the Enterprise and the presence of Commodore Matt Decker, the commanding officer of the Constellation and the last survivor after his mistakes have resulted in the death of his entire crew. Throughout its history, Star Trek often introduces senior officers as obstacles for respective captains to overcome, but Decker’s behaviour here makes perfect sense as he attempts to deal with what he has done. Indeed, Decker is said to be a friend of Kirk’s, which implies that he must have been an upstanding and rationale Starfleet officer before the events of the episode. However, Decker has now become a version of Captain Ahab from “Moby Dick”, obsessed with destroying the Planet Killer and prepared to put the Enterprise at risk in order to do so. With Kirk stuck on the Constellation, there are some great scenes as Decker pulls rank on Spock, who is powerless to stop him. McCoy is well used here as a means of presenting the emotion of the situation (I love the way that he manages to make adding “Sir” to one of speeches sound like an insult). When Kirk finally makes contact with the Enterprise again and realises what Decker is doing , we see probably his first act of real subordination as he is the one person prepared to stand up to Decker. Kirk’s anger at the commodore endangering his ship manages to be both satisfying and amusing.
William Windom's performance as Decker is great, making the commodore suitably restless in his body language and the way that he is constantly playing with some data bricks. It’s a role that gives plenty of scope for going over the top but Windom generally manages to avoid this; the closest he comes in his first scene and even there he seems subtle compared with William Shatner’s shouty line readings as he demand that Decker tell him what has happened. Despite Decker essentially being an antagonist for the first half of the episode, he is still ultimately a sympathetic character with his decision to sacrifice himself in an attempt to destroy the Planet Killer by flying a shuttlecraft in it. It is a nice inversion of the cliché that his actions aren’t actually successful, but he doesn’t die completely in vain as it gives Kirk the idea to create a bigger explosion using the Constellation. The climatic scenes as Kirk sets the Constellation for destruction but his attempts to escape are frustrated by inevitable problems with the transporter manage to be very tense even despite the fact that we all know that he will be fine.
No definitive explanation is given for the origin of the Planet Killer, other than the fact that It appears to come from another galaxy. Kirk theorises that it is a Doomsday Machine left over from an ancient war, but there is no evidence for this. His attempts to compare it the H-Bombs causing so much concern in the world when the episode was made are unusually clumsy for a show that doesn’t normally need to explain its metaphors. However, this is a very small problem in a script that manages to make so much from a very simple situation and which is satisfying in both its plot progression and character work.
Planetary Gazetteer
The Rigel colony: Located on a planet that is at risk from the Planet Eater. It is presumably in the same star system as Rigel VII as featured in “The Cage” and “The Menagerie”.Starship Spotting
The USS Constellation is the first Starfeet starship other than the Enterprise to actually appear in the series. It has the same design as the Enterprise (not yet named as Constitution class) since it was portrayed by a commercial model of the Enterprise. Its registry number is very similar to the Enterpise (NCC-1017) as a result of the model kit’s decals just being re-arranged! The Constellation has been under the command of Commodore Matt Decker; there is no explanation as to why its captain has thus higher rank (other than to provide him with the ability to outrank Kirk with the story, anyway). The Constellation has been badly damaged in an attack by the Planet Killer, but Scotty is able to repair its impulse engines and a phaser bank. It is destroyed together with the Doomsday Machine. Decker wears a different Starfleet logo; since he is the only Constellation crew member to appear it is unclear whether this is due to his rank, or if this was worn by everyone on the Constellation. The Science Officer on the Constellation was called Masada.The shuttlecraft that Decker steals is not named on screen but it appears to be the Galileo, resulting in the destruction of the shuttle featured in “The Galileo Seven” and “Metamorphosis”. This is problematic in terms of the order in which the episodes were originally transmitted since “Metamorphosis” was shown after “The Doomsday Machine”.
General Observations
- No Stardate is given for the current events, but Decker’s log states that the Constellation encountered the Planet Killer on 4202.1. This is the first Stardate in the 4000s.
- Neither Walter Koenig nor Nichelle Nichols appear in the episode. Uhura’s communications position is instead taken by a new female officer, Lt Palmer. John Winston appears again as Kyle (his sixth appearance), back in his familiar position as the transporter operator after his role as a bridge officer in “Who Mourns For Adonais?” A number of other Enterprise crew members appear in the episode – Washburn, Elliot and Russ who are all part of the damage control party sent to the Constellation (although only Washburn is named on screen with the other names used only in the credits), plus Montgomery (the security guard who is beaten by Decker in an unusual fight scene that doesn’t feature any of the regular characters).
- McCoy gives another version of his catchphrase when he states that he is a doctor, not a mechanic.
- George Takei doesn’t get to do much as Sulu in this episode, but I love his little satisfied smirk when Kirk and Spock finally convince Decker to stand down.
- “Space Dock” is mentioned for the first time (Scotty states that it is the only facility that would allow him to repair the Constellation’s warp drive.


















