Following the departure of Aidan Turner at the end of last series, the fourth run sees the departure of Sinead Keenan and Russell Tovey.
Joining remaining star Lenora Crichlow (Annie) are Michael Socha (Tom), promoted from guest star to full series star, and Damien Molony as new Vampire Hal.
Speaking about the changes, Crichlow says: “I missed Aidan and Sinead a lot, but the essence of Being Human, the love, enthusiasm and integrity of the show, is still there.”
She promises: “Episode one is high high drama. Think huge tears, and huge shocks, but it is also very exciting. It will have you on the edge of your seat!”
Serious creator and writer Toby Whithouse adds: “We knew this year was going to be especially tough because of the various cast changes.
“Not only would it be our first series without Aiden, but Russell had decided that series 4 would be his last, and Sinead had decided that her Being Human journey had come to an end after series 3. The mountain before us seemed even higher than usual.
“But once we’d stopped rocking and shaking, we saw Series 4 as an opportunity: we could invent new characters, expand the show in different directions, create new worlds and monsters and heroes, and add new layers to the overarching Being Human mythology.
“Suddenly Series 4 was a genuinely thrilling prospect.”