Dexter now knows that he made a big mistake after identifying that Travis was the real Doom's Day Killer. Now he is racing to identify the Doomsday Killers' next victim while his department are into Travis too. Meanwhile, the surprising reaction of Debra to a crime scene leads her to wonder if she depends too much on her brother. Here's the summary of this episode: Travis teams up with a couple whom he met via Gellar's blog to kill Holly Benson (the former Whore of Babylon whom Travis previously let go) and to unleash Wormwood. Dexter tries to get one step ahead of the Doomsday Killers and figure out where their next victim could possibly be before they attack again, and Debra begins to realize she relies too much on her brother after reacting to a crime scene.