Jack Shindo and Stanley Haggard are members of the first manned expedition to Mars, and on the red planet find a giant slug-like monster, Goudes/Gudis. Shindo is pinned by a rockslide and Haggard tries to escape in their ship but is blown up by Gudis. Suddenly a giant warrior, Ultraman Great, arrives and fights Goudes, but when Ultraman is on the verge of victory Goudes changes into a virus and travels to Earth where it mutates other creatures into monsters and awakens existing ones. Needing a human host to survive on Earth, Ultraman joins with Jack, allowing him to become the mighty alien when all seems lost. He joins UMA in order to help them battle the monsters.

The film is set in Australia, where an accidental future time traveler finds himself going back in time to change events to prevent a calamity.

将TV版葛雷奥特曼前半部整合而成，主线为与戈迪斯的对抗。

Bad Boy Bubby is just that: a bad boy. So bad, in fact, that his mother has kept him locked in their house for his entire thirty years, convincing him that the air outside is poisonous. After a visit from his estranged father, circumstances force Bubby into the waiting world, a place which is just as unusual to him as he is to the world.