Outer planets of the Solar System in fiction

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The outer planets of the Solar System are hypothetical or fictional planets on the edge of the Solar System, beyond the orbit of Neptune, which sometimes serve as settings or references in science fiction. A hypothetical trans-Neptunian planet was sometimes referred to as "Planet X", where "X" signifies an unknown quantity (as in mathematics). Following the discovery of Pluto in 1930 and its general reception as the ninth planet of the Solar System, a hypothetical additional planet was sometimes called a "tenth planet". An informal sci-fi tradition assigns the Solar System's tenth planet the name Persephone.

1 "Planet X"
2 Tenth planet
3 Persephone
4 Other references

[edit] "Planet X"

Fictional references to "Planet X" include:

[edit] Literature

In the Cthulhu Mythos, Planet X may be either Ghroth or Yuggoth, though the latter is normally believed to be Pluto.
Planet X is the name of a Pocket Books novel that depicts a meeting between Marvel Comics characters the X-Men and the Star Trek characters that originated in Star Trek: The Next Generation, set in the Star Trek universe.

[edit] Film

The low-budget, black-and-white sci-fi classic The Man from Planet X (1951)[1] is said by some to be the first authentic space-alien movie — although some would award that honor to The Thing from Another World (1951).
In the sixth Godzilla film, Monster Zero, aliens, known in Japan as X-seijin and in America as Xians, hail from Planet X (located between Jupiter and Saturn).

[edit] Animation

In some Looney Tunes cartoons set in space, such as Duck Dodgers in the 24½ Century, there is a "Planet X". The name is noted by a bland sign sticking out saying "PLANET X", a giant letter X on the planet's surface, or the planet having an X shape. In Duck Dodgers, Planet X is located by following a trail of planets respectively labeled A, B, C, and so forth.
The animated television series Exosquad depicts Planet X as an invisible world composed of dark matter. It was discovered by the Pirate Clans who named it Chaos and later offered it as safe haven to the Exofleet.
In Transformers: Cybertron, Planet X is a mysterious X-ringed purple mechanical planet that is the home of Sideways and Soundwave.
In the Japanese animation, Sailor Moon, Planet X is called Nemesis and it is the home and base of the enemy from the Dark Moon clan.

[edit] Games

The computer RPG Ultima II has a Planet X that must be visited to acquire an artifact.
Planet X also appeared as a level in all three Timesplitters games.
In the Zillion video game, Planet X is the setting of the Norsa's vast underground labyrinth that the player must infiltrate.
In the video game Jet Moto 3, the last unlockable level is Planet X.

[edit] Other

In the X-Men comic series, Planet X was the name of a story arc in the "New X-Men" comics in which Magneto wanted to reverse the Earth's polarities and rename it Planet X.
Planet X was also featured in the sci-fi hit, Amazing discovery
One of the Tom Swift, Jr. novels, "Tom Swift and the Visitor from Planet X" uses "Planet X" to designate an apparently inhabited distant world from which the young inventor may be receiving messages.

[edit] Tenth planet

Fictional references to a "tenth planet" include:

[edit] Literature

In H. P. Lovecraft's Cthulhu mythos, Yuggoth (or Iukkoth) is identified with Pluto by Lovecraft himself; however, other writers claim that it is actually an enormous, trans-Neptunian world that orbits perpendicularly to the ecliptic of the solar system, accompanied by three moons: Nithon, Thog and Thok. Yuggoth first appears in The Whisperer in Darkness, written in 1930, more or less simultaneously with Pluto's discovery.
In the Robert A. Heinlein novel The Puppet Masters (1951), a character names the planets in the solar system; after Pluto comes Kalki.
In Robert Anton Wilson's Schrödinger's Cat trilogy (1980), the tenth is named Mickey (and the eleventh Goofy).

[edit] Television

In Doctor Who (1963 onward), the solar system contains several additional planets. The planet Cassius is located beyond Pluto. Another planet, dubbed The Tenth Planet, is called Mondas and is the home of the Cybermen. Mondas is/was a twin planet of Earth which left the solar system.
The TV series Space: 1999 (1975) features the tenth planet, named Ultra, which was investigated by the manned Ultra Probe in 1996. In the first episode, "Breakaway", another (presumably eleventh) planet named Meta is the focus of another manned expedition.
On the 1980s sitcom ALF, the Alien Life Form called the tenth planet Alvin (and the eleventh Dave). See Alvin and the Chipmunks.

[edit] Animation

In the anime series Space Battleship Yamato (1974) (known in North America as Star Blazers) there are eleven planets in the solar system. The tenth is only ever referred to as Planet 10, but the eleventh is given the name of Brumus.
In the popular Japanese anime Sailor Moon (1992), in both the manga and the anime, there exists a 10th Planet called Nemesis which is controlled by Death Phantom from the Black Moon Clan. The planet was said to be radiating negative energy and can disappear from sight, only trackable via X-rays. This may possibly be a reference to the star, Nemesis, the postulated stellar companion to our Sun.
In the animated television series Exosquad (1993), the Solar System contains an invisible tenth planet composed of dark matter. It was discovered by the Pirate Clans who named it Chaos and later offered it as safe haven to the Exofleet.
In the Mutant Chronicles universe (1993), the 10th Planet, Nero, is the home of portals used by The Dark Legion to gain access into our galaxy through which they plan to enslave or destroy mankind. The planet is named after the Imperial Cardinal who had prophetic visions of the black planet, visions which also warned him of death.

[edit] Film

The 1984 cult film The Adventures of Buckaroo Banzai Across the 8th Dimension has aliens from Planet 10 crossing the eighth dimension and invading the Earth, although the novelization clarifies that this is intended to be the tenth planet of a distant star, not our own solar system.
In the motion picture K-Pax (2001), the character played by Kevin Spacey, an alien, tells the character played by Jeff Bridges that there are ten planets in Bridges's solar system.

[edit] Comics

The Judge Dredd comic strip in 2000 AD has a tenth planet called Hestia, which actually orbits the Sun at nearly the same distance as the Earth but at such an angle to the plane of the other planet's orbits that it was not discovered until 2009. It is inhabited by a small colony of humans. However it also has an intelligent indigenous population, who keep their distance from the colonists. The planet is also home of the lethal Dune Sharks (flying shark-like predators which can burrow beneath the ground), some of which were transported to Earth by persons unknown, and which now inhabit the Cursed Earth desert.

[edit] Persephone

Persephone is a name frequently put forward for a future tenth planet:

In Larry Niven's Known Space universe (1964 onward), Persephone is a small gas giant with a single moon, Kobold.
Although not considered canonical, a 1970s publication entitled Star Trek Maps suggests that, in the Star Trek universe, the solar system has a tenth planet called Persephone that orbits at a great distance from the Sun. No canonical film or TV episode has yet supported this, however.
Arthur C. Clarke makes several references to a tenth planet called Persephone in his fictional works, including his novel Rendezvous with Rama (1972).
In Douglas Adams's novel Mostly Harmless (1992), the tenth planet is officially called Persephone, but nicknamed Rupert (after "some astronomer's parrot"), and is inhabited by the crew of a spaceship who have forgotten almost everything about their mission, except that they are supposed to be "monitoring" something.

[edit] Other references

The eponymous planet in Zecharia Sitchin's 1978 book The Twelfth Planet is Nibiru, counted as the twelfth planet after Pluto, the Earth's Moon and the Sun are also included. Other names given for the planet are Draco (as in Anthony Austin's Draco - The Tenth Planet) and Pan.