A newDexteradventure is in progress.

Molly Brown, from filmSenior Year, has been cast as Dexter’s younger sister, Debra Morgan.

Jon Kopaloff/Getty; Ted Ely; Stuart C. Wilson/Getty

Dextershowrunner and executive producer Clyde Phillips returns.

DEXTER ORIGINAL SIN SETS CAST WITH GOLDEN GLOBE WINNER CHRISTIAN SLATER, PATRICK GIBSON AND MOLLY BROWN FOR PARAMOUNT+ WITH SHOWTIME®

Christian Slater, Molly Brown, and Patrick Gibson to star in “Dexter: Original Sin” for Showtime.Jon Kopaloff/Getty; Ted Ely; Stuart C. Wilson/Getty

The original series ran for eight seasons, from 2006 to 2013, on Showtime.

This newest installment will be set 15 years before the original show began.

According to the official announcement, it follows Dexter “as he transitions from student to avenging serial killer.

When his bloodthirsty urges can’t be ignored any longer, Dexter must learn to channel his inner darkness.