Being Human creator Toby Whithouse has played down actor Aidan Turner's exit.
Vampire John Mitchell, one of the central characters in the supernatural drama, died in the third series finale last year.
Despite not planning to kill off Mitchell, Whithouse told SFX: "Losing Mitchell is the least of our problems, to be honest! I think that you just attack the new stories and the new characters with a lot of confidence.
"Much as we loved and adored and respected Aidan, there comes a point where you just do forget he was in it, because actually what you're seeing on screen in series four is so fantastic."
Werewolf George Sands will be written out of the show this year, after Russell Tovey announced his decision to quit the role in November. Sinead Keenan also recently quit her role as Nina.
BBC Three's fourth run of Being Human will begin on Sunday, February 5 at 9pm.
