David is a widowed science fiction writer who adopts Dennis, a young boy who claims to be from the Red Planet. David believes the child acts strangely in order to process the difficulty he has had in his young life, but soon both David and his sister, Liz, begin to wonder if the boy might be telling the truth.

Based on the book by David Gerrold. Special features: audio commentary with producers Corey Sienega and David Kirschner, writers Seth Bass and Jonathan Tolins; "Handle with care: working with the Martian child" documentary; "The real Martian child" featurette; deleted scenes; theatrical trailer.