While visiting New York City with his parents so he could shop for an important costume for an upcoming masquerade ball at the school, our hero to be meets Dr. Light and is offered a tour of the Light Laboratory. Within a nearly forgotten closet, the young man finds what looks like a mock up prototype of a robot dog designed to be humanoid. Fearing that Dr. Light wouldn't let him use it for the school dance, he secretly borrows it with the intention of returning it later and has an encounter with Dr. Wily where the young man manages to save Mega Man from a trap. Removing the suit later turns out problematic which prompts him to return to Dr. Light for help to remove the costume.
Aside from the canon Megaman characters who will be guest starring in various episodes, other more unique allies will be appearing. Dr. Jewel is a female scientist whom Dr. Light enlists to aid the young man in his new heroic career; Paulie "Spike" Burnston is normally the high school bully but when he sees the costumed Felix in action later he chooses to help the hero as often as possible; and Angeline Wick is a girl whom Felix knows little about although being a practicing witch with real magical powers is always helpful.
Felix Smythe (our hero) is a young teenager of below average height (if Rush could stand up like a man, he would be taller than Felix.) He has spiky brown hair, green eyes, and fair skin. He normally wore a Red and Forest Green striped tee shirt, blue jeans, and sneakers. When wearing the dogbot suit, he stands a bit taller (almost making him eye to eye with Mega Man) and he has a Red and Dark Green armored suit with a canine like helmet. As Mega Dog, his suit is a lot like Mega Man's except for the helmeted dog head and tail. He uses a transformation device provided to him for his use by Dr. Jewel so he can change between his human form and his hero form. Rush likes Mega Dog a LOT!