Thunder Rider, Guardian of Earth — Episode 4

Armed with supernatural might, he saved the world from aliens. Honored by the President, he hangs up his armor to marry his fiancée. Mistaking him for a nobody grunt, she dumps him on the spot and launches a battle arena to find the "real superhero." But when chaos strikes the arena, he unveils his true identity—leaving his foolish ex and the entire world on their knees!