Callum Blue is a little-known British actor. But the first half of that description will soon change.

The CW has confirmed that the actor - who appeared in Showtime's Secret Diary of a Call Girl - has been cast as Phantom Zone evil doer Zod on season nine of Smallville. He'll be a regular next year.

As reported earlier, Blue joins Brian Austin Green on the series. The latter was cast as Metallo last week.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.