While on his way home, Kevin tries to save a mother and child from a rampaging Rhino and is transformed into a superhero. Kevin briefly battles the Rhino, and shortly after Kevin is defeated, he realizes that he is in his father's body. Mangog, a foe of Thor, resurfaces and threatens New York City. The young hero teams with Thor, to battle the monster. Kevin accepts his new identity as Thunderstrike, along with a new image, and continues his adventures under the mentorship of Brunnhilde the Valkyrie.