Justin tries to get Dona to admit that Marcus is his son. Donna ends up lying to Justin when she tells him he is not Marcus' father. Donna tries to convince him that she cheated on him when they where together. Bridget and Nick decide to throw a surprise party for Stephanie. Ridge tells Brooke about Eric's plans to legally adopt Marcus. Stephanie is surprised by the party but Jackie is worried about her when she has a persistent headache that wont go away. Stephanie's condition gets worse as she tries to convince herself that she is going to be fine.