So, Teenage Extraterrestrial Ninja...Aliens? With a maybe on the Teenage and Ninja part.
Wait, do they come to Earth and study Ninjutsu or did they know it beforehand? Why would aliens have something called Ninjutsu?
And this alien planet also has a 2nd sentient species that looks like rats, or is Splinter from here? If they are capable of interstellar travel why are they using swords and nunchaku?
I'd usually suggest we wait for a script or at least actual plot details but this is Bay, the script will just be drawings of things blowing up and pages from a Victoria's Secret catalog.
Screw it, bring on the explosions!!!