With DNA evidence showing that Scully is in fact Emily's mother, Mulder travels to San Diego to help his partner make sense of it all. Mulder thinks it's all related to Scully's abduction where he believes her kidnappers extracted her ova. Dana continues to receive anonymous phone calls which they trace to the children's center where Emily is staying. Emily falls seriously ill and has a strange cyst on her neck. Mulder finds that his attempt to get information about her illness leads him straight to the shape-shifting alien bounty hunters who have been keeping an eye on her. Mulder traces Emily's birth to a surprising location and makes a shocking discovery.