I think there might be a misunderstanding — there is no widely recognized movie called The Hippopotamus (2025). The film most commonly known by that title is from 2017, based on the novel by Stephen Fry.
Here’s a summary of that film — in case that’s what you meant:
The Hippopotamus (2017) – story summary
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The main character, Edward “Ted” Wallace, is a once-promising poet and now a bitter, down-on-his-luck theatre critic. Having not written poetry for years, he’s reduced to writing snarky reviews, drinking a lot, and generally feeling sorry for himself.
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When Ted gets fired after insulting a poorly done play, he reconnects with an old friend. That friend asks him to come to their country manor to investigate claims of miraculous healings.
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At the estate, there is a teenager: Ted’s godson, David Logan. David is rumored to possess healing powers — apparently able to cure illnesses and even revive a dangerously sick horse. Guests and family alike are eager to believe in David’s “miracles.”
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Ted, cynical and grounded, sets out to investigate. Over time, he begins to suspect that what’s presented as miracles may be illusions, delusions, or worse. As the story unfolds, he discovers disturbing truths about how these supposed miracles are being used, and about the dark underbelly of the people who want to exploit them.
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The film mixes dark comedy, satire, and a kind of grotesque morality tale. Ted’s own failures, disillusionment, and cynicism — contrasted with others’ gullibility and desperation — make for a biting look at faith, hypocrisy, and human nature.

If instead you did mean a movie from 2025 and it involves a hippopotamus, perhaps you’re thinking of a different film like Pepe (2024) — a very different story.
If you like — I can check for all recent films (2023–2025) with “Hippopotamus” in the title, and see if there’s something that matches what you recall.
Do you want me to build that list for you now?

