Invasion America (1998)

Years ago, Cale Oosha, a brave and good-hearted leader of an alien race, tried to stop plans for an Earth invasion with the help of beautiful earthling Rita Carter. Together they had a son, David, now 17-years-old. David only recently discovered his half-alien/half human lineage and that he is destined to lead the defense of the planet against hostile aliens, including the evil Colonel Konrad.