After accidentally causing the death of his son, geneticist William Blakely wakes in a house tended by a man who introduces himself as his twin brother. His brother explains that William was involved in a car crash. William can remember nothing of his life and must be taught basic concepts, such as how to walk and respond to knock-knock jokes. Together, they watch old footage of William and his twin as children. Though William does not recognize his estranged wife Jules, he is entranced by her. William's brother is finally called to return to work at Next Corp, and he leaves William alone in the house for the day.