Mars

Mars is the fourth planet of the Solar System. Most notably it is the home planet of Amy Wong. The western hemisphere is owned by her phenominally wealthy parents, Inez and Leo Wong.

It is also the site of Mars University where Professor Farnsworthis a teacher in the mathematics of quantum neutrino fields. Amy Wong attends Mars University, and Fry is an official dropout.

In the 20th century, Mars was a "dreary, uninhabitable wasteland". However, it was "eventually made livable" when Mars University was founded in 2636. There is reportedly a tropical jungle filled with earth native animals with subtle differences, such as elephants and tigers that climb trees.

Generation One animated series
The Earth Defense Command has a base operating on Mars.

The Headmasters anime
Having harnessed the plasma energy released when the Transformers' homeworld of Cybertron was destroyed, Decepticon Headmaster leader Scorponok sought to generate and collect more of the energy to fuel his ambitions. To accomplish this, Scorponok plotted the destruction of Mars, and ordered the Terrorcons to plant plasma energy bombs beneath the surface of the planet Mars at strategic points which would, when detonated, rip the planet apart.

The Decepticons' activities were discovered by Spike, Daniel, Wheelie and the Trainbots, who were on Mars conducting a geological survey at the time. The Autobot Headmasters were called in to deal with the threat, but during the battle that ensued, Fortress Maximus was de-powered by a plasma energy blast. Scorponok took the opportunity to activate his newly constructed Transtector and travel to Mars where he pummeled Maximus before ordering the planet's destruction. Two clusters of bombs placed at the Martian planetary poles were detonated simultaneously by Soundblaster, beginning a chain reaction that started to tear Mars apart. Scorponok and the Decepticons evacuated while the Autobots were consumed by the inferno, but Fortress Maximus was able to absorb some of the energy released in the early stages of the conflagration and made his escape as Mars exploded.

Incredibly, the destruction of Mars had a minimal impact on the various planetary orbits throughout the Sol system, and the fate of its moon was not divulged, but its absence did disrupt the gravimetric balance of space bridge travel, destabilizing it.

Note: ''An extra line is added into the RTM 1 dub version of "The Final Showdown on Earth (Part 2)" that has Fortress state that the Autobots plan to "rebuild Mars" somehow. While it is, of course, hard to credit any changes from the RTM 1 dub as being deliberate, this particular change happens to patch a continuity error from Victory very well, as noted below.''

Victory anime
Ore acquired from Mars, coupled with ores from Earth and other planets, was used in the creation of Schaeffer Energy. Jean Minakaze happened to be visiting the Schaeffer Energy plant in America as a cargo ship carrying a payload of Martian ore returned from its space mission.

Note: ''When the origins of Schaeffer Energy are related, it is implied that Mars still exists. Although apparently just a plain ol' continuity error, it does line up with Fortress's RTM 1 dub promise (above) surprisingly well, making one wonder if it could have actually been done deliberately. Setting this oddity aside, though, it might be theorised that the ore was obtained from the remains of Mars floating in space.''

Armada
Jetfire and Starscream once travelled to Mars in seach of the Mini-Con panel containing Firebot. Upon hearing this, the kids asked the two Transformers to buy them something from the souvenir shop. Sadly, as Mars was uninhabited by either human or alien lifeforms, there were no shops to be found. Starscream did however find a mysterious glowing green rockand gave it to the children. They were so happy.

Joke's on them - its probably radioactive.

Energon
Ten years after the defeat of Unicron, the Cybertronian Alliance and the Earth Federation installed a facility on the surface of Mars to mine the potent naturally-occuring ore Energon. Unfortunately, this facility was decimated by the initial Terrorcon attack, leading Carlos to aptly remark "Holy frijoles".

Also Tidal Wave was stationed on Mars, by the autobots during the Cybertronian Alliance, to guard the Mini-Cons who were sent there.

A little while later, the survivors of the first attack, Autobot, Decepticon and Mini-Con, made a valiant last stand against a second Terrorcon attack, this time being personally led by Scorponok.

Cybertron
Thunderblast, Ransack, Crumplezone and Thundercracker left Earth on a rickety rocket, attempting to forge the New Decepticon Army. Their rocket made it as far as Mars before crashing and stranding them on the planet.

Neosapien War
Mars was the industrial center of the Homeworlds, its population consisting almost entirely of Neosapiens. Prior to the First Neosapien Revolt, most of the Neosapiens were slaves on Mars and even after their official acceptance of their free will, most of them remained living there in very poor conditions. In fact, Mars was the place most of them were bred in the first place, the largest facility buried beneath Olympus Mons. This facility was destroyed by the Able Squad during the Neosapien War.

Phaeton, the leader of the Second Neosapien Revolt and later the Supreme Ruler of the Neosapien Empire, had been the Governor of Mars before the war (the only Neosapien in such high rank) and he has used his carte blanche to restructure the entire industrial complex of Mars to produce military machines like E-frames and space fighters in a matter of weeks after the Exofleet left to pursue the Pirate Clans. Thus, Mars became the stronghold of the Neosapien regime and despite Exofleet's numerous attempts, it was never truly retaken.

After Phaeton's capital has been transferred from Mars to Phaeton City (formerly, Chicago) on Earth, General Typhonus, Phaeton's Minister of Battle Forces, was left in charge of maintaining its industry. When Admiral Winfield negotiated with Jonas Simbacca, the Leader of all Pirate Clans, about an alliance, Mars was promised to the Pirates in return for their help against Phaeton.

Later, the Able Squad discovered an extraordinary extraterrestrial installation (a facility or a giant living creature, which even Professor Algernon hesitated to identify) buried beneath one of Martian deserts. After several fruitless infiltration attempts by both Terrans and Neosapiens who followed them, the installation self-destructed, reducing Mars to another asteroid belt and sending a signal into deep space, which apparently attracted the attention of a new, aggressive alien race (whose nature wasn't explained in the series, since it ended with a cliffhanger).

Destruction of Mars was a heavy blow to the morale of Neosapiens, but it also stirred a great lust for revenge in them. The Pirates, however, did not quit the alliance with the Exofleet even though its part of the deal was no longer possible to fulfill and fought along its side to the end. Pheaton would later believe that the destruction of Mars was purposely executed by Exofleet, leading to concoct a plan to destroy Earth as well in revenge. After the war, Professor Algernon modified his GRAF Shield to reconstruct the planet and with extensive terraforming, Mars was brought to its original shape. In Dragon Ball GT, the use of the Black Star Dragon Balls caused Mars to explode again. It was later restored.