LeBron James plays a yeti named "Gwangi" in the upcoming Warner Brothers animated film, Smallfoot.

It's not out yet, but third through fifth graders and their families from LeBron's I PROMISE school saw the world premiere on Sunday, complete with the "white carpet" treatment.

You can watch the fun of the premiere in the player above. The film's director will be spending time with the I PROMISE students, teaching them about the film industry.

Smallfoot, which also features Channing Tatum, James Corden, Danny Devito and Zendaya, opens on September 28.

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