Jack is a young boy. He is bookish, careful and thoughtful, but he is NOT a nerd! Jack has tremendous curiosity about the world around him and loves to take notes about his observations. Jack tends to be very cautious in new situations, and his adventures in the Magic Tree House help him develop his confidence. He has a good (and protective) relationship with his younger sister, Annie, though her more impetuous nature often gets on his nerves. This is a big role and requires a strong singer and actor. When auditioning, you might mix and match your Jack and Annie hopefuls to see which ones have the best brother-sister chemistry.