Glen Powell had a strong reaction to watching “Hidden Figures” the first time … but, it wasn’t exactly a happy one — admitting he puked after leaving a rough cut of the film.

The actor appeared on the “Therapuss with Jake Shane” podcast this week and got real about starring in the hit 2016 biopic … saying he totally blanched after watching an early screening.

GP — who played real-life astronaut John Glenn in the movie — says he watched the movie before the effects or music had been put in, a very bare-bones version … and, he genuinely thought he ruined the movie.

Powell says he left the room feeling like he’d done a disservice to the memory of the real women who helped get America to the moon during the ’60s — while also tanking all his costars’ hard work … and, he got so overwhelmed he threw up into the bushes on the Fox lot.

Glen says the added aspects the first cut lacked ended up making the movie a whole lot better in the end … so, he probably flipped out a bit too soon.

It seems he and his costars ultimately did just that … “Hidden Figures” is a critical and commercial success — racking up a 93% on Rotten Tomatoes while bringing in more than $230 million at the box office. It also earned three Oscars nods — including Best Supporting Actress for Octavia Spencer.

Powell’s new movie “Hit Man” is available to stream now on Netflix … hopefully, he kept his breakfast down after watching this one through. 🤢