Mogo is a sentient or "living" planet, technically genderless but often casually referred to as male. When it is desired, its affiliation with the Corps is marked with foliage arranged into a green band, marked with the standard Green Lantern Corps lantern symbol, circling Mogo's equatorial area.
In its early appearances, Mogo is not a social Green Lantern and its interactions with the rest of the DC universe are not well documented. It avoids announcing its presence, preferring to represent itself using pseudonymous holograms. In Mogo's first appearance, it is explained that the planet-sized Mogo's gravitational field would wreak havoc on any other planet it would try to "visit"; hence Mogo "doesn't socialize."
Bolphunga the Unrelenting, an alien hunter, was one of Mogo's first direct adversaries; having tracked the legendary Green Lantern Mogo to the planet where he apparently 'resided', Bolphunga subsequently spent years searching the planet for Mogo, examining various plants and animals for any sign of a power ring, until closer examination of patterns in the foliage led him to realize just what Mogo really was, prompting him to flee Mogo in a panic.
In one incident, it sent holograms to purchase Lobo's dolphins. When Lobo tried to retrieve them, a Mogo hologram persuaded him not to. The dolphins turned out to have a symbiotic relationship with Mogo, eating space debris that fell to his surface. Lobo never discovered he was dealing with a sentient planet. At the same time, Mogo has allowed alien races to live on its surface and has been willing to change its climatic conditions to suit them. These inhabitants of Mogo may not always know that their home is alive and watching them.
This storyline contradicts a Green Lantern annual where Kyle faces the bodies of many dead Green Lanterns, Mogo included, all of whom try to destroy him.
Mogo appeared in Green Lantern Corps: Recharge #2, requesting back-up against Rannian and Thanagarian forces. Green Lanterns Kyle Rayner, Guy Gardner, Stel, and Green Man were dispatched to clear out the enemy fleets, and then enjoyed a respite on Mogo's surface (Guy made metafictional remarks about Mogo wanting to socialize, recalling the famous Alan Moore story).
With the restoration of the Green Lantern Corps, Mogo has taken on the role of a training and recreation planet for his fellow Green Lanterns. Soranik Natu, Kyle Rayner, and other Lanterns have traveled to his sector to ask for his counsel. Further, while defending Mogo from an attack by the Sinestro Corps, the Green Lantern Arisia explained that Mogo is responsible for guiding Lantern power rings without users to those who can overcome great fear, and says that "without him, the rings are directionless".
Mogo played a major role in the conclusion of the Infinite Crisis, in which the Green Lantern Corps, Superman and Kal-L stop the villainous Superboy-Prime. The Supermen took the deluded Superboy-Prime into the red sun Rao in a desperate gamble to depower him. With their powers waning, the Kryptonians crash land on Mogo. Superboy-Prime is defeated by Superman, but Kal-L dies of his injuries. After the fight, the rest of the Green Lantern Corps, who have suffered fatalities themselves, take Superboy-Prime into custody.
In the 52 storyline, as Adam Strange and Starfire's ship is hurtling towards a sun, Mogo appears and rescues them.
In Tales of the Green Lantern Corps Annual #2 (1986), a prophecy narrated to Abin Sur suggests that Mogo will be the last Green Lantern. In a battle with the "Empire of Tears", Ranx the Sentient City will explode a blink-bomb within Mogo's core, killing the sentient planet and ending the Green Lantern Corps forever.
When the Corps is rebuilt again, many Lanterns gain partners. Mogo teams up with Bzzd, an insect-sized Lantern. Bzzd was killed battling Mongul II.
In Green Lantern Corps #11 (vol. 2) Mogo apparently shows Kilowog images of his dead species, pushing him into madness and hate against the Green Lantern Corps. He then starts tampering with the minds of the Lanterns seeking advice and counseling, in the form of illusions granted by Mogo's powers, framing Guy Gardner for killing and pitting the Lanterns against each other. This behavior seems to be caused by the virus Despotellis of the Sinestro Corps, and according to Guy Gardner was actually unnoticed by the planet, who was immune to the fungus himself (stated by Green Man in issue #13). After the fungus made itself known by drilling towards Mogo's core, the sentient planet proceeded to shift its orbit into the path of an asteroid whose impact noticeably scars Mogo but eradicates the fungus, whose remnants are destroyed by the other Lanterns.
The Sinestro Corps attack Mogo with Ranx, who started to drill into the planet, with the intention of planting the blink bomb. It was revealed that Mogo is the one who guides the rings of deceased Lanterns to find new replacements, and that if he should die, the Corps would be unable to recruit members in this manner. Thanks to Sodam Yat, as well as a change in the Book of Oa permitting the Lanterns to use lethal force against the Sinestro Corps, Ranx is destroyed and the Sinestro Corps are driven from Mogo.
During the Blackest Night event, Oa is attacked by the deadly Black Lantern Corps. During the attack, Salaak decrees that all rings from fallen Green Lanterns should be sent to Mogo, so as not to endanger the lives of potential rookies. Soranik Natu then sends all injured patients from the fight to Mogo, but is sidetracked by Kyle Rayner being attacked by a Black Lantern Jade. She sends her partner Iolande to Mogo with the patients alone instead. Mogo shows up at Oa to help in the battle against the Black Lanterns with Kilowog stating "I guess Mogo does socialize after all", a tip of the hat to Moore's origin story. Mogo increases his gravity to such a degree that all of the Black Lanterns are pulled down to his surface and absorbed into his core. The superhot magma within continually burns up the Black Lantern's bodies, keeping them from regenerating their forms. Mogo describes this as "They will burn, for all eternity". The injured patients are shown to be resting safely in Mogo.
Following the successful imprisonment and destruction of the Black Lanterns, Mogo and the rest of the Green Lantern Corps along with Munk and Miri face the wrath of a red ring–possessed Guy Gardner. While Miri, a Star Sapphire, attempts to revert Guy back to normal, it is ultimately Mogo who manages to purge the infection of the red light. However, he warns that some influence of the red still remains, and that only a Blue Lantern's power ring could completely remove the influence of the red ring. Mogo soon resumes his duties of supervising new rookies as they are now being recruited.
In the War of the Green Lanterns crossover, Mogo was corrupted and taken over when Krona attacked Oa with the emotional entities and Parallax climbed inside the Central Power Battery on Oa. Krona then used Mogo to send out hundreds of Green Lantern rings across the universe to recruit more members to be brainwashed. Kyle Rayner and John Stewart tried to stop Mogo while wielding Blue and Indigo rings respectively, but they could not reach him because of the Black Lantern energy Mogo had absorbed from the events of "Blackest Night". John Stewart used his Indigo Tribe ring to absorb the Black Lantern energy, and was forced to destroy Mogo by firing a Black Lantern constructed bullet into his core and destroyed it. Mogo's sudden destruction caused fragments of his body to rain down onto Oa destroying multiple structures,knocking out many rogue Lanterns under Krona's control leaving an opening for Hal and Guy to get to Krona almost unimpeded. After Krona is apparently killed by Hal Jordan, Mogo's corpse is now orbiting around the planet Oa. After the ensuing chaos along with Krona's death and Sinestro gaining a green ring, Kilowog states that as long as Mogo's corpse floats above Oa, the Corps will be disheartened. He gets numerous Lanterns together and they move his pieces into the nearest sun, giving him a "funeral pyre". The resulting reaction from Mogo's body being put into the sun causes a Mogo-like Green Lantern stripe to appear, forever honoring the planet.
The New 52
Following Mogo's destruction, the Guardians contact John Stewart to claims that Mogo's remains appear to be moving towards a particular location, suggesting that Mogo is trying to reform itself, and assign Stewart to track it. While traveling, he encounters Fatality, who reveals that Mogo is actually a male and female consciousness that were 'mated' at the core, with John's fragment of Mogo containing the female consciousness that seeks to be reunited with its mate, prompting Fatality to use her Star Sapphire powers to help the endangered love come together.
John and Fatality arrived at the location of Mogo's pieces that are held prisoner by the space pirate that is using Mogo's power as the ship's energy beam weapon to attack the planet's core, threatening their lives. John and Fatality spring to attack the space pirate to free Mogo by sending the space pirate to crash on the planet. John finds out about the Guardians wanting to use Mogo. Mogo then reforms all its pieces into a planet's orbit after the events of "War of the Green Lanterns". The Guardians reveal their plan was to use size of the reformed Mogo and assimilate it into the Third Army, but their plan failed when Mogo destroyed the Third Army that was trying to assimilate it.
In the Legion of 3 Worlds, it is revealed that in the 31st century Mogo has been long dead and without him, there was no way to distribute the rings and thus no Green Lantern Corps.
Powers and abilities
In addition to the standard powers of a Green Lantern Power Ring, Mogo can also alter his weather and surface conditions such as plant growth, and travel through space at faster-than-light speeds. Mogo has a form of sensory or extrasensory awareness of what is happening around and on it. However, his wellbeing is largely sustained by the constant supply of energy from a Green Lantern power battery. Without it, he eventually loses his strength and even falls into a seemingly comatose state. Mogo also telepathically guides the Green Lantern Power rings to their bearers.
Green Lantern Vs. Aliens
In the Green Lantern versus Aliens limited series, Mogo was also the adopted home of a group of Aliens. It seems that years ago, Hal Jordan and a group of fellow Green Lanterns were charged with dealing with these Xenomorphs following the death of a Green Lantern, and Hal Jordan wanted to avoid killing them if possible, believing that they were just animals, and thus were not evil. His solution was to deposit them on Mogo, where they would be a threat to no one and would be able to live. Years after that, however, Kyle Rayner and other Green Lanterns, including Salaak traveled to Mogo to rescue the crew of a crashed freighter. This was Rayner's first encounter with the sentient planet, although he didn't speak to Mogo directly. Most of the GL squad did not survive. However, due to its non-canon nature (as evidenced by the dead GLs showing up alive later), in their next encounter, Rayner does not remember this event.
Mogo appears in the Batman: The Brave and the Bold episode "The Eyes of Despero", Despero takes control of Mogo as part of his plan. It is later freed by G'nort. Here, Mogo exhibits an increased control of its land mass.
Mogo appears in the Green Lantern: The Animated Series episode "Lost Planet", voiced by Kevin Michael Richardson, as a stowaway planet that has caused numerous ships from throughout the universe to crash onto himself, so that he could imprison the criminals on board the fleets to keep them from harming others. This incarnation emits a massive projection of a power ring around its equator, giving planet the appearance of "wearing" the ring.
Mogo appears in the movie Green Lantern: Emerald Knights. He first appears in a flashback story told by Hal Jordan which is an adaptation of his premiere story. At the climax of the film, Mogo arrives to help his comrades defeat Krona, and since that involves sacrificing the evacuated planet Oa, he volunteers his own body for the Corps' temporary headquarters afterward.
Although Mogo has appeared in promotional advertising art for the 2011 Green Lantern film, this character does not appear in the film.