“The chemistry between the cast was better than we could have imagined," producer Chuck Roven tells PEOPLE

The Justice League goes through some serious growing pains before they finally learn how to work together, but the cast behind the superheroes bonded with each other quick as a flash.

“The chemistry between the cast was better than we could have imagined,” producer Chuck Roven tells PEOPLE of the star-studded ensemble film. “They completely connected both on and off the set.”

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“Usually, in between setups the cast will migrate and go back to their trailers but for most of the shoot, not only in between takes but in between setups, the cast would hang with each other,” Roven explained. “Whenever I would turn around or arrive on set there they would be, telling each other a story, an anecdote or laughing.”

Newcomer Fisher, 30, bonded with Game of Thrones actor Mamoa the very first time they met. “When I went to shoot my day on Batman v Superman, Jason was also in town and he must’ve heard I was in the makeup trailer getting my face done and he comes in and was just like, ‘What’s up?! Nice to meet you.’ It was like an instant friendship,” he said.

“We’re working on something that transcends us all and we’ll be together for months and months, and hopefully years and years. [It’s] just a great energy,” he added.

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“After I shot my day in Detroit, they were shooting a scene with Ben and I ended up meeting Ben that day as well — and the rest of the crew I met later on,” Fisher explained. “I met Ezra in New York and I met Gal and Henry [Cavill, who plays Superman] for the first time in London, which was pretty phenomenal. Stepping on to the set, it’s this eclectic group of personalities that all have their own comedic sensibility, it was pretty special to watch.”

Miller also spoke with PEOPLE about his relationship with his coworkers, saying, “I love this gang of weirdos. We’re all very different humans and we really love each other through and through. I personally always feel that the goodness of what we create interpersonally on a set flows into the quantum fabric of the film. I trust completely in this very esoteric understanding.”

Image zoom Jason Momoa and Ben Affleck Steve Cohn/Shutterstock

Affleck hopes that audiences enjoy seeing all their very different characters come together on the big screen. “Wonder Woman is very powerful, Aquaman is very badass — he’s got very strong and stubborn energy,” he explained. “Flash is a lot of fun and full of life and Cyborg is just a very smart and independent person.”

For Roven, seeing all the characters come together for the first time was the most exciting moment of the production. “Nothing could possibly be cooler than the moment we saw all the Justice League characters each in their own signature superhero costume, all on the set at the same time,” he said. “It was an unforgettable and electric moment.”