RDex is a runaway, but not your typical runaway. He's a young robot alien who has stolen a rocket in order to rescue his teacher, who he thinks is being held as a prisoner on earth. After crashing on earth, RDex is befriended by two middle graders, Tommy and Hawk. RDex lives in a shed in Hawk's backyard, where he watches old cowboy movies for entertainment and drinks cans of oil to quench his thirst. When Tommy and Hawk disguise RDex as a human and bring him to class, that's when the fun begins!