To mark the release, Digital Spy spoke with Michael Socha - now a series regular as loveable werewolf Tom - to chat about his character's 'bromance' with Hal, his reaction to the shocking series four finale and his hopes for series five...
Were you happy with the reaction to series four?
"Yeah, very happy. If someone ever has a word with me in the street, I say, 'Did you watch the series before?' and if they say yeah, I say, 'What d'you think of it [now]?' and they'll go, 'I'm happy with it.'
"I'm quite relieved. I've had no-one say to me personally that they don't like it - it's been great."
Did you feel any pressure this year coming on as a regular character?
"Yeah, massive. I get worried before all parts, but because everyone [from the old cast] was gone, I thought maybe the public would've lost trust in the show. But I think after a couple of episodes, people were alright again and reassured, maybe."
Do you feel like you settled in as you went along?
"Yeah, I think so. I definitely feel like I'm part of something now. I mean, I did before, which I thought was quite unique, when I came in for just four episodes of the third series. People just welcomed me - it was lovely and I felt really part of something."
The scenes between Tom and Hal (Damien Molony) were amazing - was it fun filming those?
"I loved Hal's character. Especially in the café scenes, the way Damien dropped the lines, it just f**king creased me up. I'd have to have a couple of minutes just to laugh it all out of my system! It was wicked. Damien is a brilliant actor and such a nice guy to work with, as well."
Tom had a lot of funny moments too - do you enjoy playing comedy?
"Yeah, I do. I think, with Tom McNair, it gives me such a massive scope to work with - he's funny, he's naïve, he can be aggressive and angry. It's great, Tom can do everything! There were a lot of new emotions for Tom in this series, for me to play. I loved doing it."
There was also some romance for Tom with Allison (Ellie Kendrick) - how was it filming those scenes?
"Yeah man, it was good. I loved playing the awkwardness. I've played a lot of thugs before and I've done a few sex scenes where the geezer's a bit aggressive. I remember I did a half-hour film called Harvest where I had to more or less rape an 87-year-old lady!
"So to play this as a bit nervous and a bit awkward, I loved it. And I had a real good laugh on-set with Ellie, she's a lovely person. She's so funny - it was another one where I was just cracking up!"
Were you shocked at what happened in the final episode, particularly the fate of baby Eve?
"Yeah, I was. There were rumours of it before, and I was like, 'As if they're gonna kill the baby! As if that's gonna happen! No one's ever done that before!' and then they really did. They really f**king did!
"Derek, the second AD [assistant director] was the one telling me. He told me as well about Tom getting stabbed. There's a scene - a dream sequence - in the succubus episode where Tom gets stabbed.
"Derek said to me, 'Oh by the way, you get stabbed'. I said, 'Oh, what happens then?' and he said, 'You die!' and I was like, 'Noooo!' but then that happened. Then he said, 'And the baby gets blown up at the end,' and I was like, 'Noooooo!'
Another fantastic part of the finale was Mark Gatiss as Mr Snow...
"That was an amazing character. The stillness, the f**king coolness of the man when he was doing it was so intimidating. He was another bloke who was just f**king great - there's not a d**khead on set, never a horrible actor. Every single one of them who came to our set was just a lovely, lovely person.
"I think it's something to do with the crew and the team around us. On Being Human, they welcome people and so I think [guest stars] feel like they have to be a part of this wonderful group of creative, nice people."
Were you sad to see Lenora Crichlow (Annie) go at the end of the series?
"I was, yeah, very sad. But with Being Human, it's never the end. It's never sealed that you're never coming back - you can come back. These people who die or leave do sometimes come back, so hopefully we'll see Lenora again."
Are you looking forward to starting filming on series five?
"Yeah, I can't bloody wait. I just want to do it. I thoroughly enjoy doing Being Human so I just want to get back there and working on it now."
It might be too early to say what's coming up for Tom, but what would you like to see happen in series five?
"I want Tom to get possessed by an evil spirit, so I can do summat f**king nasty! I'd like to make Tom really dark. But they won't listen to me, 'cos I'm just a kn*bhead from Derby!"
Being Human: The Complete Fourth Series is now available to buy on DVD and Blu-ray.