Invincible

Mark Grayson A.K.A Invincible is half-human half-Viltrumite, he is the son of Omni-Man who was once Earths greatest defender turned out to be a Viltrumite warrior trying to conquer the planet. Unlike his Father Mark refuses to join his conquest and wants to help people, Mark is now the only hero on Earth that stands a chance against the Viltrum Empire.