John Krasinski doesnt usually fret about reviews. But for his new film IF, he is terrified of the response from two people: His 7 and 10-year-old daughters.

Ive never been worried about two reviews more in my life, Krasinski told The Associated Press in a recent interview. Im genuinely terrified. I hope it goes well.

IF, about a young girl (Cailey Fleming) and her neighbor (Ryan Reynolds) who can see everyones imaginary friends including those that have gotten left behind, is one of this summers major studio releases opening on May 17.

In a landscape full of brands and franchises, its the rare original idea that has the backing of a big studio, Paramount, and an ambitious scale and scope.

It was shot largely in New York by Oscar-winning cinematographer Janusz Kaminski and blends live-action and animation with an army of celebrity voices including Steve Carell, Phoebe Waller-Bridge, Matt Damon, Jon Stewart, Maya Rudolph and the late Louis Gossett Jr .

The idea to make a film about imaginary friends started and evolved with his kids, whom he shares with actor Emily Blunt (who also voices a character). At first, it just sounded like a fun, family friendly idea.

My kids are extremely imaginative, Krasinski said. I always used to say to Emily, I just, I wish we could go wherever it is they go, just for a little bit.