List of Dexter characters
On a visit to his sister, Dexter and Debra both feel as if they have been drugged; just before he passes out, Dexter sees Hannah standing over him. When he later regains consciousness, Dexter begins investigating Hannah, and finds that she has changed her name and married Miles Foster (Julian Sands), a wealthy businessman. Dexter goes to see Hannah, who says that she had wanted him to kill Foster, but changed her mind after realizing she is still in love with Dexter. Foster warns him to stay away from Hannah, and has him beaten up. Dexter goes to Foster's boat to protect Hannah, but finds that she has already killed him. The two of them dispose of the body, and promise to watch out for each other. The two end up having sex and rekindle their relationship.
Dexter (season 1)
Through Debra, Rudy tries to get closer to Dexter. Dexter comes first to realize that Rudy killed Joe, and later affirms that he is the Ice Truck Killer. With his identity blown, Rudy kidnaps Debra and draws Dexter into a trap to rescue her. Rudy reveals to Dexter that he is his older brother Brian Moser, also left in the shipping container when Laura was killed. However, unlike Dexter, he was sent off to live in series of mental institutions. Brian too has developed serial killer tendencies, but did not have the morals that Harry instilled in Dexter, and used the Ice Truck Killer approach to help Dexter recall his past. Brian suggests to Dexter they kill Debra together, but Dexter refuses. Brian gets away after a fight, and Dexter rescues Debra.