The Bad Moon Arising... The relationship between OCD vampire Hal and the throughly creepy Cutler is central to this week's Being Human - 'Making History' kicks off in 1950 with the pair's first meeting, where, in a neat role reversal, a timid Cutler is cornered and transformed into a blood-sucking fiend by a cool and sinister Hal...
The flashbacks in Being Human have always been a joy and these period sequences are indeed terrific, with Hal cutting quite a dash in fedora and long coat. Back in the present, it transpires that Cutler - who's planning a "tribute" for the Old Ones - has more or less modelled himself on his old mentor.
Yes, he's essentially a Hal fanboy - so imagine his excitement when said vamp comes storming through the front door. Hal and Cutler's trading places act continues as, in a string of nicely-cut sequences, we see Hal corrupting Cutler in the past, while in the present, Cutler attempts to lure Hal back to his old blood-sucking ways...
Both Andrew Gower and Damian Molony excel - the former plays both the timid early Cutler and the deranged present-day model with great skill, while the latter does a great job in reminding us that Hal was not always the stuffy but cuddly figure we've come to know and love ("F**king kill her!").
And while we saw it coming, the reveal of poor Alex - mutilated by the vampires in revenge for Hal doing the same to Cutler's wife - is still deeply shocking. Thankfully, the character returns in ghost form, meaning we haven't seen the last of charming newcomer Kate Bracken.
Thanks to his old accomplice, Hal's renewed bloodlust places baby Eve in danger and turns him against his friends. Again, Molony's great at portraying the character's torment, something akin to a drug addiction.
Cutler's also doing his level best to manipulate Tom, who in turn is determined to be "clever and subtle" in his dealings with the Old Ones. But alas, poor Tom is ultimately taken for a fool, and as ever the viewer can't help but feel for the loveable Michael Socha as he's used as a weapon...
The third story thread in 'Making History' follows Annie and (the woman who claims to be) Eve in Purgatory - a strange domain effectively realised through a series of neat visual tricks. Equally effective are Eve's tales of humanity falling to the vampires, accompanied by sounds of terror and devastation.
After last week's rather disappointing runaround with Emrys, it's good to see the always watchable Lenora Crichlow get some dramatic material to sink her teeth into. Gina Bramhill also succeeds in making the adult Eve likeable and sympathetic, she and Crichlow establishing an entertaining and moving rapport throughout.
Annie is stunned as Eve details the fall of mankind, and while the vampire / Nazi comparison - with the swastika-like symbol - is a little heavy-handed, the twist that Eve is the nemesis, and that Hal was a red herring, is a corker; making Molony's vamp the 'Big Bad' would've been far too obvious.
Annie returns home with a renewed sense of purpose, while Hal and Tom's storylines collide in a strong cliffhanger - werewolves are exposed to the public, and dozens of humans, plus Hal himself, are placed in peril. The cherry on top is the arrival of the Old Ones, led by the deliciously evil Mr Snow (Mark Gatiss).
This penultimate episode boasts fewer laughs than we've come to expect from the fourth series of Being Human, but that's only appropriate given that we're approaching the finale - things are stepping up a notch, so it's worth losing a few of the lighter moments for the kind of visceral thrills that 'Making History' delivers.
Let us know what you thought of this week's Being Human below!