Being Human actor Michael Socha has dropped hints about Mark Gatiss's guest role.
Sherlock star and co-creator Gatiss will play the vampire Mr Snow in a forthcoming episode of the supernatural drama.
"He's one of my favourite guest stars," Socha, who plays werewolf Tom, told Entertainment Weekly.
"He really, actually, genuinely scared me when I was doing scenes with him. He's incredible."
ocha also admitted that he had been nervous about joining Being Human full-time, following the departure of original stars Russell Tovey, Aidan Turner and Sinead Keenan.
"At first, I was quite nervous," he confessed. "Being Human has got such a massive group of fans - a very hardcore, loyal group of fans. I thought that they had the potential to lose all of them.
"But I think now that people have actually watched the show, they've gotten themselves back into it and trust us nearly, if not as much, as the previous cast."
Being Human continues on Sundays at 9pm on BBC Three. In the US, the new series airs on Saturdays at 9/8c on BBC America.
