Dexter: Season Two
After learning about his blood-filled past in Season One, Dexter Morgan has come under the suspicion of a fellow Miami Metro Police Department member. Sgt. Doakes thinks that by tailing Dexter, he'll discover why Dex seemed to know more about the prior season's Ice Truck Killer than he was letting on. Due to the tail, Dexter has been unable to kill any fellow serial killers (to help deal with his unnatural compulsions). Instead, he's taken to bowling and spending more time with his girlfriend and her two children.
More than a month after killing his biological brother, Dexter finally gets the chance to commit another murder. He isn't able to go through with it, and after several failed murder attempts, when the police discover his underwater burial ground, Dex is starting to think he's lost his touch. Also around this time, Rita (Dex's girlfriend) discovers that Dexter set up her abusive, addict ex-husband in order to send him back to prison and free Rita from his clutches. Rita believes that the only way Dexter could have set up Paul is by planting his own drugs at the scene, and forces Dex into rehab.
Once there, he finds an unorthodox sponsor who seems to really understand him and his strange compulsions (of course, his sponsor, Lila, believes the compulsions revolve around heroin). Her understanding allows Dexter to reveal more of himself and control his urges to kill. By this time, Miami Metro has brought in the FBI to deal with the murderer the media has dubbed "The Bay Harbor Butcher." Dexter manages to evade the blame by throwing his colleagues and the FBI off the scent, and destroying case evidence. By sheer luck, Doakes's interest in Dexter's activities makes him the prime suspect.
Season Two manages to humanize Dexter and give him some of the feelings he had always lacked. However, this season also introduces the supremely annoying Lila. By the end of the season, even her British accent is grating, and the viewer is rooting for Dexter to kill her. Just as addicting as the previous season and a strong continuation of the foundation.