The Fandom Post is reporting that Tubi TV has added the God Mars anime film to its service. The film is available in the original Japanese language with English subtitles.
The story of God Mars is described as:
A young boy is sent from a distant star to destroy Earth, but after experiencing the beauty of the planet and its inhabitants, begins to question his mission. With the aid of the powerful robot God Mars, the boy struggles to protect Earth from his own people, and as a result, is forced to do battle with his very own brother.
Source: The Fandom Post