[[quoteright:350:http://static.tvtropes.org/pmwiki/pub/images/Phantom_Planet_lobby_card.JPG]]
[[caption-width-right:350:Who's a good Solarite? ''You'' are! Yes you are! Yes you are!]]

->''"Captives of a power far, far out!"''
->''"Science Shocker of the Space Age"''
->''"See!! A 6 ft. astronaut shrink to 6 inches before your very eyes! See!! The Moon Maidens! See!! The attack of the Fire People! Staring DOLORES FAITH the Girl from Outer Space!"''
-->--'''Taglines from the film's poster'''

Astronaut Frank Chapman has been sent out into space with [[RedShirt Navigator Ray Makonnen]] on a search for another pair of astronauts who died. After [[{{Narm}} some odd philosophy]] from Makonnen, the two are separated when a meteor storm hits the ship and Makonnen is propelled into space while Frank is left barely conscious.

Luckily, Frank's rocketship lands on what he claims to be a wandering planet, the "Phantom Planet" of the title, where Frank encounters a race of [[{{Lilliputians}} tiny people who are six inches tall]]. [[YouFailBiologyForever After the planet's atmosphere causes him to shrink to their size]], Frank is forcibly integrated into the society of the planet Rheton. Over the course of the film, he deals with a love triangle between an aggressive woman named named Liara ([[Franchise/MassEffect not that one]]), her own suitor Herron, and CuteMute Zetha, whom Frank ''really'' falls for. Over the course of the rest of the film, Frank learns the history of the strange world, duels with Herron, and helps fight off an invasion of the Solarites. Though the invasion leads to Zetha finally gaining the ability to speak, Frank learns of a way to leave Rheton and return to his original size. Zetha gives him a rock to remember her by and the films ends with Frank being rescued by astronauts from earth while contemplating the rock and trying to figure out if the whole film was a dream.

The movie was later featured in an episode of ''MysteryScienceTheater3000'' ''([[Recap/MysteryScienceTheater3000S09E02ThePhantomPlanet episode 902]])''.
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!!Tropes:

* AllJustADream: It's left up in the air whether the whole Rheton thing was a vivid dream. Frank seems to think the rock Zetha gave him confirms it was real, but... it's just a rock.
-->'''Frank:''' Now they'll never believe me...
-->'''Mike:''' [[CreepyMonotone I'll have to kill them all.]]
* AllThereInTheManual: In the comic book that came out when Phantom Planet was released, it's explained that Ray Makonnen was formerly a priest, explaining his speech, which is a paraphrasing of a quote from clergyman Richard Cecil, and his reciting The Lord's Prayer as he drifts off into space.
* BettyAndVeronica: With Zetha as the Betty and Liara as the Veronica.
* BittersweetEnding: Chapman escapes, but can't be with Zetha, who he loves. It was [[DownerEnding worse in the comic book]], [[spoiler: The Phantom Planet is completely destroyed when Chapman escapes, and any inhabitants killed.]]
* ContemplateOurNavels: Ray Makonnen's oft-mocked speech.
-->'''Ray''': You know, Captain, every year of my life, I grow more and more convinced that the wisest and best is to fix our attention on the good and the beautiful... if you just take the time to look at it.
* CuteMute: Zetha, [[SubvertedTrope though she's able to talk at the end.]]
* DefeatMeansFriendship: Herron and Frank hate each other until Frank beats Herron at Combat Rod. Shortly afterwards they're good pals. While Herron is still eager to see Frank off to regain his status as alpha male, he thinks of it in terms of helping Frank. Frank is convinced that he and Herron would've become buddies on any planet.
* DissonantSerenity: "But I am plagued with regret when I am forced to destroy." Said by Sessom with a warm, avuncular tone and a broad smile.
* DoesNotLikeShoes: The women on Rheton go barefoot, the men on Rheton don't.
* DuelToTheDeath: The Duel of Rheton, which is a kind of inverse Tug of War (two people hold a rod and try to push the other onto a high gravity plate). Herron challenges Chapman out of jealousy when Liara shows an interest in the Earthman. Chapman wins, but refuses to kill Herron, which marks DefeatMeansFriendship.
* DullSurprise: Frank seems to be barely awake throughout the entire movie.
* FlashbackCut: By the end of the movie, there is a quick montage recapping Frank's experiences throughout the movie, ''including scenes from just a few minutes ago.''
-->'''Crow''': We didn't like this stuff the first time!
* FullNameBasis: Liara initially has trouble with the idea of someone having two names, and calls Frank "Frankchapman"
* IncredibleShrinkingMan: "See!! A 6 ft. astronaut shrink to 6 inches before your very eyes!"
* JerkAss: Frank Chapman. Par for the course for a 1950's white male lead in a B-movie, for the most part.
* LoveMakesYouEvil: Liara appears to be plotting some dark revenge after Chapman refuses her, but we later discover... [[SubvertedTrope no, she wasn't]].
* MagicPants: Averted. Our hero is starkers upon being shrunk within his space suit. If it weren't for the conveniently large crowd of guys pulling him out of his suit he'd probably be very cold and embarrassed.
* NoOSHACompliance: The high-gravity plates used in the duel just sit there in the middle of the main room with absolutely nothing keeping anyone from stepping on them and being vaporized.
** Made even worse by the fact that when we first see the plates in operation, they're clearly ''turned on'' by someone. Meaning it's possible for them to be turned off. Which means that rather than these plates being some weird tech that can't be turned off, the people of Rheton are just really stupid and/or lazy.
** Nothing to keep our space men from flying out into space while trying to pull repairs on their ship.
** This isn't forgetting what is apparently an auto-closing door that apparently can only be opened up from the ''inside.'' It seems OSHA doesn't exist in the future...
-->'''Mike''': "...c-could you just give a message to my wife and kids if you have the tim- well, nevermind."
* ThePiratesWhoDontDoAnything: Frank Chapman doesn't do anything ''remotely'' heroic, while the proud people of Rheton just... fly away. That's it.
* SpaceDoesNotWorkThatWay: The astronauts are able to easily walk along the wing of their rocket... in outer space.
** At one point one of the Earth rockets just takes a sharp left... in space.
* {{Technobabble}}: Any technical dialogue is really nothing more than several inappropriately-used scientific terms strung together.
* WoobieDestroyerOfWorlds: The captured Solarite is supposed to be evil, but comes off as... cute. It doesn't help he was a prisoner and primarily acting in self-defense.
* YouFailBiologyForever: Apparently, Rheton's atmosphere will cause you to shrink. But thankfully all you need to get back to normal is air from your homeworld.
** The only effect this has on the plot is to explain why the planet Rheton is so difficult to locate. There are a hundred ways they would have explained that without shrinking people to 6" tall.
* {{Zeerust}}: The movie's prologue takes place on March 16th... ''1980''.[[note]][[MST3K Crow]]: Oh, our ''old'' future.[[/note]] The rest of the movie, and technology, pretty much fits with early 1950s imaginations of the future, despite coming from 1961. And Frank was making ready for a mission to Mars before being sent out to look for the expendable RedShirts from the opening.
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