This is a monster movie without great monsters, an alien invasion movie without great aliens, a disaster movie that glosses over the disaster, a movie about an alien taking over a pop singer's body that barely mentions the pop singer, and movie that warns about atomic energy that doesn't do enough to make it serious.
Overall, the real warning is that this movie is a dud.
Imagine a movie in which an alien species need to send a message to humans. Knowing only one human, they make a clone of Taylor Swift. She infiltrates a nuclear lab to tell a scientist his energy formula is the only thing that can generate enough power to blow up a planet on a trajectory to hit earth. But only the aliens can harness the energy and he has to give it to them. Meanwhile, the people of Earth, led by Bruce Willis and Ben Affleck, attempt to knock the runaway planet off course with atomic bombs and mining equipment. And for some reason there is a mob boss is also trying to steal the energy formula. In the end, the aliens take the formula and help the Earthlings by destroying the planet, but not before buildings are wrecked and parts of Japan are flooded.
This movie is what happens when way too many concepts are jammed into a low budget movie. None of the ideas have a chance to breathe and none of the actors have a chance to be relatable.
They should have just called Gamera to destroy the incoming planet. Then they might have had a movie worth watching.
Grade: 1 intergalactic starfish out of 5.