On the planet Baab, astronaut Scorch Supernova is a national hero renowned for his daring missions. His brainy brother, Gary, is a nerdy but capable technician at Mission Control. When they receive a distress signal from the notorious Dark Planet (Earth), Scorch eagerly sets off on a rescue mission, despite Gary's protests and warnings about the dangers of this unknown territory. Upon arrival, Scorch is captured by the evil General Shanker, who intends to exploit his advanced alien technology for his own gain. Forced to devise a plan to save his brother, Gary travels to Earth, leaving his wife and son behind.

Gary finds himself navigating through a hidden government facility filled with captured aliens from across the universe. During his mission, he encounters a variety of alien species who help him in his quest. As Gary overcomes various obstacles and confronts General Shanker, the brothers must work in tandem to escape and return to their home planet. Along the way, Gary learns the value of courage and teamwork, and both brothers reconcile their differing perspectives while uniting against a common enemy.