Luke Andrew Kruntchev

Dexter and the Homicide team race to catch the Doomsday Killers before their final act; Deb copes with a new emotional reality.

After capturing a killer, things go awry for Miami Metro; Dexter begins a dangerous game of cat and mouse, while the Ukrainian mob seeks revenge.

Dexter must protect himself when LaGuerta closes in on his secret.

Hannah's father visits; the Phantom Arsonist's crimes become more gruesome; LaGuerta brings in Matthews to help with the Bay Harbor Butcher case.

Christmas approaches and Dexter tries to balance his life with Hannah and his relationship with Debra; Debra follows a potentially incriminating tip.

Mike's Christmas spirit gets dampened when Ryan (Nick Jonas, guest star), the father of Kristen's baby, unexpectedly comes back to town after a long absence. Kristin's boyfriend, Kyle, also doesn't know what to make of Ryan's return. Meanwhile, Ed hires Mandy as an elf at Outdoor Man, where she tries to unionize the other elves to get better perks.