Ultimate Mercenary v20
Ultimate Mercenary v20 is a series written by Jeanne Morningstar about Ultimate Mercenary's adventures on Earth-20. Trapped in another world where Ultimate Ninja never even existed, after a mysterious cosmic odyssey, he wants to find a way to return home, and find a place for himself until he can... But he is far more connected with it than he can know.
See also Ultimate Mercenary Reading Order.