As a youngster John Wyatt saw his parents killed and his brother kidnapped. On a wagon train heading West he meets his brother who is now a spy for the gang which originally did the dirty work. He and...

　　外星人试图使地球失去引力，这时，只有圣诞节的馈赠精神一个叫做X 的小外星人才能拯救世界...