Ryan set out to rescue Claire when Carroll learns where his ex-wife is being kept in protective custody. Meanwhile, Emma and Jacob are reunited, and Ryan turns to an old friend for help.moreless
When Nick investigates the death of a construction company owner, he discovers that the suspect has summoned the Reapers to town to dispose of him. Meanwhile, Juliette makes Nick invite Eddie over for dinner.moreless
While Carter closes in on Reese and Finch and the CIA close in on her, the two men investigate a suspicious building super whose number has come up.
In the season finale, religious zealot Travis (Colin Hanks) continues his plan to bring about the end of the world, leading him to kidnapping Dexter's (Michael C. Hall) son, resulting in a climatic and bloody battle between the two of them on a boat.moreless
Danger arrives to Miami Metro. Dexter continues to try and lure Travis in while Deb continues to see her therapist.
The mirror-match continues. Travis enlists some new acolytes. Miami Metro gets two new breaks. Dexter finds himself in hot water, confused about what to do with Wormwood.
Dexter, using what he's learned from Brother Sam, comes a step closer to the Doomsday killers, specifically Travis; Deb and LaGuerta go head-to-head after a call girl ends up dead.
Miami Metro gets closer to Gellar and Travis thanks to the new intern. Meanwhile Dexter deals with faces from the past. Travis tries to move on from Gellar.
With the help of his newfound friend Brother Sam, Dexter wonders if there is light within him to counter the darkness, while the search for the Doomsday Killers takes him in a new direction; Batista and Quinn pay a visit to the university where Professor Gellar taught; due to departmental regulations following the shooting, Debra is forced to begin therapy.moreless
The team investigates murders that have a religious undertone to them.
Dexter faces a serial killer from his past; Debra has problems with her new position and Travis with Gellar think of their next move.
In order to solve the mysterious murders, Homicide asks for the help of Brother Sam, who Dexter knows used to be a serial killer. Debra has two proposals, one personal and one job-related.moreless
Dexter uses his 20 year high school reunion as a chance to hunt the prom king. It's going fine until he is called to the scene of a vicious faith-based murder leaving him with questions about what he wants to pass on to Harrison. Debra who is finally in a good place with her relationship with Quinn and her job becomes an unexpected hero.