Sarah Michelle Gellar will boss around a certain serial killer in training in Dexter: Original Sin. In a special guest starring role, Gellar will play Tanya Martin, the CSI Chief at the Miami Metro Police Department and Dexter Morgan’s (Patrick Gibson) new boss.

The 10-episode original drama series from Paramount+ With Showtime, set in 1991 Miami, follows Dexter, a student who is refining his killer skills with the help and support of his adoptive father Harry (Christian Slater). In his dad, he finds solace and understanding, especially as his bloodthirsty urges grow and can no longer be ignored. As his only confidant, Harry teaches Dexter a code that’s designed to help him find and kill people who deserve to die — all while avoiding getting caught by law enforcement. This is a particular challenge for young Dexter as he begins a forensics internship...