Unhuman is, well, unwatchable
Saw and The Collector luminary Marcus Dunstan's zombie-horror-comedy mostly fails at all three

If you’re a fan of Marcus Dunstan and Patrick Melton, scribes of the later Saw sequels and the Feast trilogy, you know what to expect from them: gore, vomit, red filters, and maybe a half-clever plot twist. If you’re not a fan, it’s best to stay as far away as possible from Unhuman, a cheap-looking, awkwardly calibrated horror-comedy which only the team’s truest devotees could love.
Directed by Dunstan, whose The Collector was superior on every level, the movie begins with a title proclaiming it “A Blumhouse After School Special,” followed by a card “revealing” it’s “presented by the student-teacher division—STD.” This is as clever as the humor gets. The story proceeds to introduce us to the usual teen movie archetypes—jerky jocks, sensitive comic-book and D&D dorks, goth princesses, prom queens, introverts—before loading them onto a school bus for a field trip. Conveniently, they’re required to surrender their cell phones to the extremely hammy supervising teacher (Peter Giles), getting that essential modern horror shortcut out of the way.
It isn’t long before a big explosion of blood hits the bus’ windshield out of nowhere, sending it crashing and busting the cheerleader’s nose. But that’s the least of their worries; the radio, on an emergency broadcast frequency, warns of a chemical weapons attack. Next, a scary-looking metalhead knocks on the bus’ front door. Zombies aren’t generally smart enough to knock, right? Wrong. Every movie makes its own rules, and before long the teacher’s face gets bitten off. The kids make a run for it out the back door, and make it to an abandoned building seemingly repurposed into a kind of funhouse for rave kids. But it soon becomes clear that they’re expected—someone or something planned for these specific kids to show up on this day.
Now, granted, zombies pose an immediate threat, especially since these seem like the running kind. But everyone seems remarkably unfazed by the whole “chemical weapons attack” part of the scenario. Sure, protect against the immediate threat, but also maybe cover your faces? Or at least, in these Covid times, make some joke about masking being tyranny to explain it away? Never mind. That would be funnier than anything else in the movie.