In the anime series Gundam Seed and Gundam Seed Destiny, Junius Seven is a PLANT-type space colony that ultimately became the symbol of two tragedies of the first and second Bloody Valentine Wars. An agricultural PLANT, it was one of the ZAFT's few sources of food that did not have to be imported from allied nations on Earth.

By C.E. February 11, 70, the Earth Alliance and ZAFT were at war, but neither side had launched any major offensive operations. That day, the Agamemmnon class carrier Roosevelt, covertly loaded with a nuclear missile by a group of Blue Cosmos members within the Alliance military, left Ptolomaeus Base on the Moon, headed for the "Junius City" area of the Zodiac Alliance for a show of force. In mid-flight, authorization was given by the Atlantic Federation for Roosevelt to use the force she was intended merely to show. On February 14, during a fierce battle between the defending ZAFT ships and the Roosevelt and her escorts, the nuclear missile was fired from a TS-MA2 Moebius mobile armor and it hit Junius Seven. The blast caused the colony to break apart, killing 243,721 Coordinator men, women, and children. The attack was quickly dubbed the "Bloody Valentine Incident" after the date. "Remember Junius Seven" became one of the rallying cry of pro-war Coordinators, especially of PLANT Supreme Council member Patrick Zala, whose wife Lenore was killed in the attack.

While attempting to rendevous with the 8th Fleet, the Archangel came across the wreckage of Junius Seven. Desperately low on supplies, they gathered what they need from the debris of the colony and paid their respects to the dead in the form of origami flowers.

When a cease fire was declared following the Second Battle of Jachin Due, a formal peace treaty between the Earth Alliance and the PLANTs was signed onboard ship near Junius Seven. The wreckage of the colony is preserved as a war memorial. In C.E. 73, a group of veteran ZAFT extremists playing into the hands of Blue Cosmos attach plant Flare Motors all over the colony's remains, harnessing solar wind to send it on a collision course with Earth. Despite heroic attempts by ZAFT forces to destroy the colony and defeat those extremists before it falls on Earth, they fail and the shattered pieces of Junius Seven rain down on Earth, causing massive devastation, which ultimately leads to a renewed war between Earth and PLANT.