Pop singer Christina Milian and Sarah Michelle Gellar (“Buffy the Vampire Slayer) are catching a ride with everyone’s favorite blood splatter analyst and his dark passenger in the prequel series “Dexter: Original Sin.” Set 15 years before the events of the original “Dexter” series, the new show introduces young serial killer Dexter Morgan as a forensics intern for Miami Metro PD.

Milian plays young Maria LaGuerta, Miami Metro’s first female homicide detective ( and the department’s captain on the original show). Gellar plays CSI Chief Tanya Martin, one of Dexter’s supervisors on the force who is completely unaware she’s teaching him how to avoid capture.

Patrick Gibson (“The Tudors”) is the new Dexter Morgan. Molly Brown (“Evil”) is his potty-mouthed sister, Deb. Christian Slater (Heathers) plays Harry, Dexter’s adoptive father with a code. James Martinez (“House of Cards”) is homicide detective Angel Batista and Alex Shimizu (“The Terror”) is pervy lead forensics investigator, Vince Masuka.

Emmy winner Michael C. Hall, who played Dexter in the original series, returns to narrate the show as Dexter’s inner voice.

“Dexter: Original Sin” premieres Dec. 13 on Paramount+ with a 10-episode season. Showrunner Clyde Phillips–the man behind “Dexter’s” brilliant first four seasons (and its god-awful “New Blood” return in 2021)–is back as showrunner.