Super Mario and the Grand Star

Bowser and his minions have gone to war with the Mushroom Kingdom, though the tides of the war are constantly shifting.
To help shift the war in his direction, Bowser travels to the Moon in search of a prophesied ancient relic known as the Grand Star.
The situation goes from bad to worse when Bowser awakens Khonsu, one of the last surviving members of an alien civilization.
Khonsu seems to think the people of Earth killed his people many years ago, and vows to destroy the Earth to get revenge.
It's now up to Mario to save the world from Khonsu!