In outer space 15 light years away from the earth, a group of peace-loving blue people live on the Baab star in the technologically prosperous world.Among them, Scotch (voiced by Brendan Fraser) is a brave and righteous superhero on the planet. He often drives the Supernova-9 spacecraft through the universe. Under the command of his brother Gary (voiced by Rob Corddry), he successfully completes the mission of rescuing trapped aliens again and again.On this day, Skogg, who had just returned home, was ordered by BASA chief Lena (voiced by Jessica Alba) to go to the Dark Planet - Earth to perform a rescue mission immediately.Worrying about the safety of his brother, Gehry had an argument with Skogg who was determined to move forward.Under the gaze of all Baab stars, Skogg successfully arrived in the famous District 51, but was captured by the military led by General Shatner (voiced by William Shatner).In order to save his closest brother, Gary, who has always been cautious, had to embark on a dangerous journey, and the conspiracy behind all this also quietly surfaced...