Recently I found myself thinking about slug-like aliens that crawl through people’s ears and into their brains, with the ultimate purpose of global domination. It would explain a lot about what has gone so wrong with the world, wouldn’t it? And it was why I immediately flashed back to the children’s fantasy series Animorphs when Donald Trump’s health secretary and conspiracy theorist, Robert F Kennedy Jr, admitted to having had a worm in his brain.

While visiting my parents in Cleveland, Ohio recently, I realised that a few books from the children’s fantasy series were still sitting on the shelves in my old bedroom. No fewer than 54 Animorphs titles were published between 1996 and 2001, and a total of 35m copies have been sold. “I may have just landed a job thanks to Animorphs,” my childhood friend Clifton texted me with excitement in the mid-2010s, when we were fresh out of college. “It was an interview for a vegan food cart and the last question they asked me was what Animorph I would morph into. I said an orangutan.”

The premise sees five adolescent friends encounter a crashed alien spaceship and then face an intergalactic war against the Yeerks, genocidal slug-adjacent beings that slither into the brains of the host species. The young humans are given the ability to transform into any animals they’ve touched, along with the simple task of defending humanity. My generation were told we could grow up to do anything, that life was a continual arc of progress towards better........

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