As Capt. Jack Harkness, John Barrowman was only ambiguously dark. When he crosses the pond and steps into Wisteria Lane, however, he won't just be dark ... he'll be completely sinister.

And, his time on "Desperate Housewives" has just been extended.

Speaking on BBC's "The One Show," Barrowman revealed that his character will be introduced an episode earlier than originally planned and confirmed that his character is nothing short of evil.

"I leave in about a week and a half to do 'Desperate Housewives,'" he said. "I just found out today that I was supposed to be doing 5 episodes, it has increased now to 6. So I'm really, really chuffed about that. They've decided to put my character in sooner than we thought. He's a villain, he's a bad guy and he's going to affect all the women in Wisteria Lane."

Who is this mystery man? According to executive producer Bob Daily, Barrowman will be playing the much alluded to, Patrick. When he arrives in town, Patrick will be getting very involved in the lives of all the central figures on the series and will serve as an insight into Angie's mysterious back-story.

According to reports, Barrowman may be spending additional time in the United States for an Americanized version of the "Doctor Who" spin-off, "Torchwood." However, if that is the case, Barrowman hasn't even been approached yet.

"If they do Torchwood again I would definitely want to be a part of it," he said of the series. "But I know nothing about it."