Planets, United or Otherwise

Alternate(s)

Time Period(s)

Mellorus
Memorial World of Krypton	An exact duplicate of Krypton, a memorial planet inhabited by android duplicates of the entire Kryptonian population. Created by Superman, with the aid of Supergirl and Krypto, by transforming a deserted planet in a distant solar system.
Mercury	Domed cities on Mercury use mercurian gas money as currency. (Adventure 377)
Mind-Exchange World	Planet is home to fantastic monsters. A scientist used an experimental mind-exchange device to transfer the minds of his colleagues into the bodies of monsters, then was unable to reverse the effect. Mon-El was able to reverse the device. (Adventure 316)
Mirage World	World protected by holograms of monsters. (Adventure 316)
Mixed-Sun Planet	A distant planet with two suns, one orange and one purple. The unique mixture of radiations caused metal life to evolve, and also gives ordinary Earth-people super-powers
Mlain	An uninhabited, war-wrecked planet where the Legion once fought the Heroes of Lallor (Adventure 324)
Modo	Semi-living planet ruled and controlled by Modulus. (Adventure 377)
Mogo	Mogo is a sentient and living planet. It is technically genderless, but it is often casually referred to as male. When it is desired, its affiliation with the Corps is shown with foliage arranged into a green band, marked with the standard Green Lantern Corps lantern symbol, circling Mogo's equatorial area.
Mohado	A water-world inhabited by an aquatic race. (Adventure 371)
Mole World	A planet occupied by savage, metallic mole-creatures who feed on the planet's minerals.
Monster World	World of super-powered monsters, shunned by all (Adventure 309)
Monument World	Home of monuments to a forgotten people. (Adventure 321)
Mordan	Third planet in the Ridgway system. Three continents, one major city -- total population: one million. Mordan was destroyed when its sun went nova. (Superboy & the LSH 230)
Morven	Home of the Morvenian Fear-Beast, which telepathically conquers other beasts by putting fear in their minds. (Adventure 327)
Motus	L.E.G.I.O.N. client world whose inhabitants are diminutive. Homeworld of Gigantus.
Moxia	Homeworld of Legion prospect Brawler. Moxians are real tough and can mind-mesh with all sorts of weapons and machinery, but arte also arrogant.
Murgador	A mining planet, capital city Gondra. (Superboy 220)
Murra	Home of an alien race (the Murrans) who once attempted to infiltrate the Legion as part of a plan to conquer Earth (Adventure 337)
Mutor	A planet ruled byn the hostile, shapeshifting Plasmos.
Mxyzptlk World	Headquarters of Mxyzptlk V in the 30th century.
Myar	Alchemists' planet; homeworld of Nemesis Kid.
Myrnah	Home of Braino the martyr, who used his mind-power to funnel into himself all the evil that existed on his world. It killed him...but no crime or misdeed ever occurred again on Myrnah.
Nadir	Other dimension realm ruled by King Artros. (Adventure 376)
Naltor	Homeworld of Dream Girl and White Witch. The capital city is Neuezer'x
Nara	A jungle planet upon which the Legion apprehended the body of the android Klim. (Action 389)
Neptune	Homeworld of villain Ronn Kar.
New Earth (millennium)
New Earth (sw6)	Orbital construct composed of 34 cities evacuated from Earth before its destruction.
New Genesis	Home to the New Gods.
New Krypton	A replacement world for Krypton (not Rokyn).
New Xenn	A world of xenon-bearing air. The Legion resettled the survivors of Xenn here in Adventure 318 .The name is non-canonical; it was not used in the comic.
Nolgor IV	A waterless, barren world in the Talok sector. (Superboy 213)
Not-Orando Planetoid	A barren planetoid which Princess Projectra once believed was Orando. The planetoid is inhabited by a monster called the Morgu.
Nuhass	A parched desert world with thriving markets. Also a L.E.G.I.O.N. client world.
Nullport	Drydock for the massive fleets of the United Planets, shipbuilder to the universe. Nullport is a small chunk of rock afloat in the gravity-less sea of space, with a thin energy sheath holding in its atmosphere. (Legion of Super-Heroes 285)
Nyrvn	Site of the Millennium War, which culminated in a final battle between allied Nyrvn/Earth forces and invaders from another galaxy. This event in the Legion's past made it possible for the United Planets to develop peacefully. (DC Comics Presents 13)
Oa	Oa is a planet that lies in the center of the universe and occupied to a race of blue-skinned powerful humanoids who have dubbed themselves the Guardians of the Universe. Oa's history is not clear; according to some stories, the Guardians originated in a planet called Maltus. These evolved Maltusians later moved to Oa and named themselves Oans. Oa became a convenient base of operations. Other stories had the Oans living there from the beginning.
Ogen	A 20th century medieval world under Khund occupation.
Oianus	Homeworld of Ambassador Lorval. (DC Super Stars 17)
Olo	Home to the peace-beasts. (Adventure 325)
Omega Kalphon	The Legion prevented this star from expanding and engufing its inhabited planets. (Adventure 359)
Ontaeus	A peaceful oean world which declined L.E.G.I.O.N. affiliation.
Oomar	Source of hallucinogenic, addictive lotus fruit. (Action 378)
Opatoshu-Alpha	A L.E.G.I.O.N. client world.
Orando	Homeworld of Princess/Queen Projectra. Sole inhabited planet in the Valar Three system.
Oranz	Planet raided by Roxxas and his pirates for cold light globe technology. (Adventure 307)
Orax	Home of the dreaded Oraxian Cyclops. (Adventure 358)
Orsde	Sister planet of Imsk.
Other (see below)	A planet outside the Legion mythos, or a one-shot unnamed planet in the mythos. These are listed under Locations in each story entry.