"Teenage Mutant Ninja Turtles: Out of the Shadows" under-performed at the box office, earning $245 million worldwide -- half the gross of its 2014 predecessor -- and catching its producers by surprise.

"We loved the movie. We loved making the movie," producer Andrew Form told Collider. "From our first Super Bowl teaser to everything we launched, we felt so good about our material, and for some reason it did not find the audience that the first movie found."

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When it came to what went wrong, Form offered, "We talk about it all the time, and we tried to figure it out, but we cannot put our finger on what happened. We really can’t. It’s just one of those things where we feel like we made a really great movie; we thought at the time that our release date was great, and we added all these new characters with Bebop and Rocksteady and Baxter Stockwell had a big role in the movie and Casey Jones and for some reason when it came to opening weekend … Even before the movie came out, we were feeling great. And you wake up two days before the movie opens and you go, 'Wow, I don’t know if this movie is tracking as well as it should.'"

Ultimately, the low box-office numbers likely spell doom for another sequel. "I don’t think there’s 'Turtles 3,'" Form said, "but I wouldn’t say there’s never going to be another 'Turtles' movie."

“Teenage Mutant Ninja Turtles: Out of the Shadows” is available on Digital HD, Blu-ray and DVD.