In the future, Earth sucks. The stars have been blocked out for so long that people have forgotten there was anything else besides the dumb World Government Alliance watching over them, training children to join the militarized Allied Youth and eliminating all resistance with a giant ray gun.
Someone hijacks the ship and takes the team to an unknown section of space, where they come face-to-face with the powerful aliens that humanity encountered when they first left Earth...and the reason the SafeSky was built.