In a not-so-distant future, a devastating galactic conflict ensues as extraterrestrial beings invade Earth, causing immense suffering and loss of life. Desperate to rescue their planet from the clutches of destruction, a valiant quartet of teenage astronauts embarks on a perilous mission to a remote celestial body. Their objective: thwart an insidious assassin who seeks to alter the course of history, forever altering the fate of humanity.