According to The Hollywood Reporter, Amanda Peet has signed on to star opposite John Cusack in New Line Cinema's The Martian Child.
Joan Cusack also is joining the cast. Menno Meyjes is directing Martian, which is based on a short story from sci-fi author David Gerrold.
The script by Jonathan Tolins and Seth Bass is described as an unusual father-son relationship, and a cross between Parenthood and ET the Extra-Terrestrial. John Cusack plays a man who, after the death of his wife, adopts a 7-year-old who believes he's from Mars. Peet will play Harlee, the best friend of the man's deceased wife. Joan Cusack will play the sister to her real-life brother's character.