Set in the intergalactic realm of Triangulum during the year M.C. 0092, the story revolves around the Light siblings—twin brothers Apollo and Ares, and their younger sister Athena. Together, they run a failing interstellar salvaging business on the Planet Myrrth.Their lives change forever when three hostile galactic factions chase a mysterious spacecraft that crashes onto their planet. While investigating the crash site, they encounter a shamanic goddess named Sylveene. She bestows Apollo with the power to transform into the Full Metal Specter—a mechanized cosmic savior. Alongside his family and Sylveene, Apollo must use his new mechanical powers to protect the populace from the Astramen, an evil menace intent on stealing the galaxy's life force.