"Recovering from a massive cast overhaul is never an easy thing for a series to accomplish. Outside of Doctor Who, I can’t think of the last time an overhaul like the one Being Human has had has been a success, certainly not on American television.
It’s arguable over whether the UK’s Being Humanhas actually succeeded in recovering the storytelling ground they lost with the departures of Aidan Turner and Sinead Keenan at the end of Series 3, followed by the departures of Russell Tovey and Lenora Crichlow over the course of Series 4. While George’s death was rather, well, heroic but anticlimactic after Nina’s unseen death, Annie achieving her doorway was one of the series’ overarching plots. Annie’s actions at the end of Series 4 clear the decks completely, eliminating any remnants of the original trio without eliminating the universe itself.
And that’s where “The Trinity” comes in. It’s time to establish the new status quo.
Personally? I have no problem with the overhaul. Yes, I loved Mitchell just as much as the next red-blooded straight female viewer, but Damien Moloney’s Hal Yorke? I found that character to be far more interesting from the beginning. When Hal first walked into Honolulu Heights in Series 4, he was possibly a more well-realized character than several others who’ve been around since series 1. Hal’s complicated history and status as an Old One makes him, quite frankly, absolutely intriguing. Why does a four-hundred year-old vampire (when he first set up shop with Leo and Pearl in 1955) suddenly give up drinking blood? Mitchell, oh, that was an easy tell, guilty conscience. Mitchell was too young to develop a hardened resolve against it all. Hal? Hal had that time. He’d been around long enough to earn a position in the Old Ones. What on earth possesses that level of predator to suddenly give it up?"