This review contains spoilers.
I quite liked the premise of The Metaphysical Engine, the penultimate episode of Class, but I also think it’s the least successful episode so far. It suffers considerably from the absence of its usual teenage ensemble cast: it’s set concurrently with the events of Detained, showing us What Quill Did while the ka-tet were busy trying not to murder each other. You’ll remember that, in Brave-ish Heart, Governor and Coal Hill headteacher Dorothea Ames promised Miss Quill that she’d remove the arn, the creature keeping her enslaved to Charlie, from her brain, in return for her help killing the carnivorous petals. The Metaphysical Engine sees Miss Quill, Dorothea and a shape-shifting alien called Ballon embark on a quest to get the things they’ll need to achieve this. The titular engine, it turns out, is an unstable alien technology that transports its users to fictional places – in this case, Ballon’s hell, Quill’s heaven, the birthplace of the arn and the Cabinet of Souls.
Unlike the previous episodes, in which the emotional development of the characters is pretty much inextricable from the SFnal plotlines, the quest structure of The Metaphysical Engine is essentially a backdrop to Quill’s journey; it’s really only a series of plot coupons designed to put the characters into extreme situations. (This approach reminds me much more of Moffat-era Doctor Who than it does of the generally more character-driven Class.) Although there’s still something of an emotional arc to the episode – Quill becomes more sympathetic as she befriends fellow soldier Ballon, who is himself imprisoned – it feels hackneyed and cheap. The ending, in which she’s forced by the Governors to witness the death of Ballon, the man she’s become increasingly attracted to, seems particularly egregious: why would the Governors go to such effort to remove the arn from Quill’s brain only to let her die? It’s just an excuse to damage this already traumatised woman still further; it adds nothing to her story, except, presumably, to drive the stakes of the last episode up.
It seems reasonable to suppose that at least some of the money saved by making Detained a bottle episode went on The Metaphysical Engine, given its extensive special effects. I think Detained is very possibly a perfect episode in its own right, and it certainly didn’t need a higher spend; but it’s ironic that it should be better than an episode that cost twice as much to make. Hopefully the final episode, The Lost, will mark a return to form.