Here is the official Being Human summary for the fourth episode of Series 3 entitled The Pack. Note: there is a large spoiler in the very first sentence, so read on with caution.

With Nina pregnant by her boyfriend, George, they’re keen to know exactly what might be growing inside her – and whether her forthcoming transformation on the full moon is going to affect it – as the hit drama about supernatural friends continues.

Having spotted a young werewolf in the woods, the couple set out to find him to see if he can help them with their questions. They find McNair, who is less than forthcoming with information.

Annie and Mitchell, meanwhile, are finding it difficult to make the transition from friends to boyfriend and girlfriend – especially as Annie is a ghost. Desperate to have a normal relationship with all that it entails, Annie comes up with a plan to get Mitchell hot and bothered in the bedroom.

Having been kept isolated from the rest of the world, McNair’s son, Tom, is excited by the prospect of more werewolves and goes to find George and Nina. His presence in Honolulu Heights, however, is not welcomed by Mitchell – the “werewolf-shaped bullet” premonition hanging heavy on his mind.

Could McNair, with his open hatred of vampires, be Mitchell’s ultimate nemesis?

Nina is played by Sinead Keenan, George by Russell Tovey, McNair by Robson Green, Annie by Lenora Crichlow, Mitchell by Aidan Turner and Tom by Michael Socha.

The Pack airs Sunday 13 February at 9pm on BBC3.