Chris Pratt says his fondest memories of shooting Guardians of the Galaxy Vol. 2 come from a day when his little boy got the chance to visit him on set.

With the long-awaited sequel rocketing into theaters soon, some of the major stars joined Jimmy Kimmel on Monday to promote the film, and they opened up about what their kids think of their involvement in the blockbuster franchise.

Pratt -- who was joined by Zoe Saldana, Kurt Russell, Michael Rooker and Dave Bautista -- said that his own son, Jack, is starting to appreciate how cool his dad really is now that he's turned four.

WATCH: Chris Pratt Is Ridiculously Charming as He Gives a 'Guardians of the Galaxy 2' Set Tour

"My favorite memory from [shooting] this movie [was when] my little guy got to come to set," the proud dad recounted. "Our director, James [Gunn], his nephew Will was there, and we got to tour them around the Guardians spaceship."

Pratt says his son enjoyed the behind-the-scenes look at the big production -- which was shot at Pinewood Studios in Atlanta, Georgia -- but it didn't really come together until he got a chance to see the ship Pratt's character, Peter "Star-Lord" Quill, flies in the movie.

"You saw it in his eyes, he thought, 'I've seen this on TV or in the movie, but I guess my dad really does fly a spaceship for work!'" Pratt remembered. "And I was like, 'Yes, son, yes I do.'"

WATCH: Chris Pratt Goes on an Adorable Fishing Trip With His 3-Year-Old Son

"It was just absolutely adorable," Rooker added of the kids' set visit. "You look at their eyes and they're going, 'Wow!'"

As for Saldana -- who plays the green-skinned assassin-turned-hero Gamora -- her role has had a big impact on her kids, and her parenting style.

"My kids think that I'm related to the Hulk," the mother of three shared, referring to Gamora's emerald hue. "So I'm using it and I'm getting them to eat their vegetables… I go behind this wall and I go, 'I'm gonna call the Hulk, 'cause you guys are not eating your veggies and he's gonna come and take your toys.'"

Saldana says she then roars out her best Hulk impression and her kids beg her not to send out the giant green behemoth.

"Not too many parents have that as a real threat," Kimmel quipped.

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Later, the five stars played a game that tested their knowledge of their fellow Guardians, and it revealed some fascinating little-known facts about the Marvel heroes.

For example, Bautista -- who stars as the fearless warrior Drax the Destroyer -- collects lunchboxes as a hobby and Kurt Russell -- who plays Peter Quill's father and an ancient cosmic entity named Ego -- once cut off his fingertip as a child to impress a girl.

Guardians of the Galaxy Vol. 2 hits theaters May 5.

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