A young Dexter Morgan transitions into an avenging serial killer.

Dexter adjusts to his new job as a forensics intern at Miami Metro; Deb lashes out at her dad by engaging in petty criminal behavior.

Dexter goes after a loan shark with ties to Batista; Deb throws a party to win the favor of her volleyball teammates.

Dexter targets a retired mob hitman; Harry works the gruesome murder case of a ten-year-old boy; Deb sneaks into a nightclub with Sofia and meets an exciting new friend.

After a kill goes wrong, Dexter is grounded by Harry; Deb deepens her relationship with Gio, and bonds with her brother on the anniversary of their mothers death.

Miami Metro is shaken by a kidnapping that hits close to home, as Dexter sets his sights on a killer that slipped through the cracks of the justice system; first, Dexter must survive a double date with Deb and her new boyfriend.