Changemen are the main protagonists in Dengeki Sentai Changeman. They are all former members of the various branches of Japanese military who were selected by the Earth Defense Force to combat Great Star League Gozma. As the Changemen, they derive their powers from mysterious energy called Earthforce, which gives its users the power to protect Earth from any threat to it.
At Turboranger, Changeman joined Battle Fever J, Denzimen, Sun Vulcan, Goggle V, Dynamen, Biomen, Flashmen, Maskmen and Livemen, standing behind the latest Sentai, Turborangers, facing the Hundred Boma Tribes.
In Gokaiger, years later, the Space Empire Zangyack invaded the Earth. The threat is so great that all the top 34 Super Sentai teams, including Changeman, need to oppose them. The 34th teams fought a heroic battle against the ground forces, but when the Zangyack fleet itself attacked them, Akarenger told everyone to combine their powers and save the earth. This destroyed the Zangyack fleet and caused them to lose their powers, which reappeared on Ranger Keys and spread throughout the universe.
The keys were collected by AkaRed and later used by the 35th Super Sentai team. Gokaigers, a group of five people from different planets came to Earth to find the Greatest Treasure in the Universe. The most powers of Changeman was originally taken by Basco ta Jolokia, who destroyed the Earth Defense Force to obtain it and eventually took it from an unidentified male EDF member. After the death of Basco, Sho awarded Gokaigers. After Gokaigers finally defeated Zangyack, they returned to Ranger Keys before leaving the Earth to find the second greatest treasure in the universe. It is assumed that Changemen regained their power like all other Super Sentai.
In Super Hero Taisen, The Changemen and the most Super Sentai heroes were involved in the "Super Hero Taisen" event. Presumably, they pretended to be defeated by Kamen Rider Decade, who was apparently looking for the Sentai teams and they were pushed to the dimensional riftIcon-crosswiki. When he and Marvelous's captain's tricks were revealed, Changeman appeared with other super teams through the size wall object - crosswiki, and then they teamed up with all other Sentai teams and Kamen Riders Icon-crosswiki against Dai-Shocker Icon-crosswiki and Dai-. Zangyack.