Original Sin ” tries to have it both ways. Not only does the 10-episode season — advance screeners of which were not provided for critics — wind the clock back to 1991, when a 20-year-old Dexter (Patrick Gibson) graduates from the University of Miami and makes his way into the local police department as a paid intern.

Dexter origin story's first episode only serves to remind us that we already know Dexter’s origin story rather well.