Being Human returns to BBC Three at the end of the month and, after its stars Russell Tovey and Sinead Keenan felt it was time to hang up their wolf ears and fangs, it's all change for the supernatural series.
The first pictures from series 4 have been released, showing the sci-fi hit's new lead stars Michael Socha and Damien Molony taking their places next to ghostly Annie, played by Lenora Crichlow - the only remaining orignal character.
However, writer Toby Whitehouse has promised: "The essential DNA of show remains the same."
Introducing the new series on the BBC website, he said:
"As ever, Being Human lives or dies on the strength of the characters and the cast, and that's why I think this series is our strongest yet.
Damien Molony joins the team as Hal. Hand on heart, I think he's one of the most exciting and versatile actors of his generation. Watching his performance grow over the filming was a joy.
Then there's Michael Socha. Promoted from semi-regular to lead. If you thought he was good in series 3, wait till you see what he does in series 4. Michael will break your heart this year.
And of course beautiful Lenora. Our star. The heart of the show. This year she gives a truly breathtaking performance. One of my favourite moments of 2011 was the first full screening of episode 2, when she left us all with our jaws on our chests."
SLIDESHOW: See photos of the new cast below...