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The 40-year-old revealed that fans can expect the new season of the Showtime series to take a turn for the dark side.
"The tone is different this season," Hall told TV Line. "There are some very dark things afoot in terms of the big bad - or bads - we're dealing with. So yes, it's dark; he's a serial killer! Dexter is neither shinier nor happier, I must confess."
Hall went on to speak about what excited him about the impending season.
"I'm excited about acting with the guest actors that we have, as I always am," he said. "I get to create new relationships with new characters and that's a part of what keeps it fresh and invigorating for me when returning to the show."
In September, it was reported that Hall was close to signing a new contract with the show. His current contract with the series expires after this season.
Colin Hanks, who stars as a character called Travis in the current season, recently claimed that Dexter's new run will surprise long-time viewers and will do things "that the show has never done before".
Dexter airs on Sundays at 9/8c on Showtime.
