2026 Sundance Film Festival Movie Review: Mum, I’m Alien Pregnant

The Midnight category is always one of my favorite categories at the Sundance Film Festival, as the category has turned out some historic films throughout the years, like The Blair Witch Project, Saw, Oldboy, and Hereditary, to name a few. But the 2026 lineup is one of the weakest I have seen in my sixteen years of attending the festival. The lineup was a mixed bag of films that had potential and fell short, and some that ended up being complete duds.

But one film in this year’s Midnight category stood head and shoulders above the rest, and that was THUNDERLIPS’ Mum, I’m Alien Pregnant, an uproarious, delirious, sticky sci-fi pregnancy tale.

An extension of their 2024 short film of the same name, Mum, I’m Alien Pregnant follows Mary (Hannah Lynch), an underachieving millennial living with her mother (Yvett Parsons) in a small apartment. Mary meets her new neighbor, Boo (Arlo Green), a recluse who barely comes out of his apartment due to his awkwardness and his mother’s (Jackie van Beek) orders. Through quick conversation, Boo reveals that he is part alien, in a reveal that had the entire theater shrieking in shock, and, in a freak occurrence, Mary becomes pregnant by Boo, and when I say freak occurrence, I mean it is one of the most bizarre sexual sequences I have ever seen in a movie. It’s a revealing, strange, hilarious, and gross sequence that had my mouth agape on the floor, setting us up for the rest of the film, which is a barrage of sequences that will make you feel gooey and sticky.

Despite help from her mother to get morning-after contraceptives, because Mary is alien pregnant, they don’t work, and the pregnancy is anything but typical, including expedited growth and constant, colorful goo in various forms coming from Mary’s body. Regular medicine won’t work. Boo is useless. Doctors don’t know what to do. And her mother is trying to help, but ultimately cannot, putting Mary in a frustrating and strange predicament.

Mum, I’m Alien Pregnant takes an absurd concept and tells its story through a mix of mostly dry humor, grotesque sequences, and a ton of heart. Watching this movie with a full house was the best way to watch it because of the communal reaction to some of the hilariously gross things that happen throughout the film, like Boo revealing his impossible-to-describe genitalia or the liquids that come out of Mary’s body throughout the movie. It is at times vile, but you cannot look away. THUNDERLIPS also keeps the film moving at a rapid pace, stacking grossout bits and great jokes within the same sequence, having us laugh and squirm at the same time, and never once letting up on the energy or the fun.

There’s a lot of chaos in Mum, I’m Alien Pregnant, but THUNDERLIPS makes sure to never lose the film’s heart. Thanks to a superb performance by Lynch, the grossness and mayhem never make us lose sight of Mary’s goal of independence and doing what she feels is right for her, a strong message in today’s society. Mum, I’m Alien Pregnant is a perfect midnight movie and one I cannot wait to see again in a packed cinema.

Mum, I’m Alien Pregnant played in the Midnight category at the 2026 Sundance Film Festival.

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