the driver and his passengers. Fickman explained: "When Dwayne's driving and two aliens appear in his cab, he's stuck with them, there is an implied contract that I will get you to your destination, because that's what he does". This is Johnson's second Disney film, following the 2007 family comedy film The Game Plan, also directed by Andy Fickman. AnnaSophia Robb as Sara, sister of Seth, a girl with telekinetic and telepathic powers. Fickman chose Robb based on her performance as Leslie Burke in Bridge to Terabithia. She is kind to Bruno and is the more compassionate of the two siblings. The only time she does not refer to Jack by his full name (Jack Bruno) is when she says goodbye to him, when she refers to him only as "Jack". Alexander Ludwig as Seth, brother of Sara, a boy with the power to control his molecular density – "phasing" to become very dense, evidently giving him some degree of invulnerability, or become insubstantial and pass through solid objects. He is very cold to Bruno at first, not trusting him very much, but apologizes in the end saying that if it were not for him they would have not finished their mission. Both siblings talk using overly formal, emotionless, and analytical voices, and are always addressing Bruno by both his first and last name in all situations. Carla Gugino as Dr. Alex Friedman, a discredited astrophysicist. Fired from her university, she is relegated to giving a lecture at a UFO conference about hard science. She becomes Jack's love interest. Fickman cast Gugino in the role as he was a fan of the short-lived television series Threshold, in which the actress starred. Ciarán Hinds as Henry Burke, the leader of Project Moon Dust. Sarcastic and unscrupulous, he has no regard for morality, as demonstrated after Seth and Sara are imprisoned in Witch Mountain when he orders them to be experimented on so he can harness their powers, regardless of the possibility that they could die. As long as he gets results, whether they live or die does not matter to him. Hinds described his character as a man in black, explaining, "I'm the head of the operation who's contacted directly by a man you never see...[It] is about protecting the country. He's responsible for it, and he'll do whatever needs to be done. That's how he sees it". Tom Woodruff Jr.