A proud warrior of the FM Planet, Omega-Xis, betrays his kind and escapes to Earth where he makes contact with Geo Stelar. Like his fellow extraterrestrials called FM-ians, Omega-Xis is capable of initiating a process known as "Electromagnetic Wave Change," which transforms ordinary humans of the same frequency as themselves into "EM Wave Humans," allowing them to freely operate in the EM Wave World. With these new powers, Geo becomes known as Mega Man, a hero of Echo Ridge. However, Omega-Xis holds the key to accessing the weapon Andromeda, capable of destroying planets. As such, many FM-ians pursue Omega-Xis with the intent of retrieving the key in their goal to destroy the Earth. Meanwhile, Omega-Xis also knows the secret to the disappearance of Geo's father in a catastrophic space accident months ago.
The first half of the series focuses on the FM-ians hunting Omega-Xis for the Andromeda Key. Eventually, they succeed, but by using Star Force, Mega Man is able to sustain Andromeda and destroy the key. In the latter half of the series, the FM-ians band together, taking the guise of their original human counterparts, and seek a way to energize a new Andromeda Key. Eventually, Gemini Spark takes the reins of the operation and succeeds in reviving Andromeda, but the FM-ian king Cepheus descends onto Earth to put a stop to all of the chaos. Geo also has an encounter with his father Kelvin who reveals that he has become an EM wave being and is still exploring space, and that Geo's place is on Earth, fighting for justice as Mega Man.
