Should you choose to go to the Fortress of Solitude, turn to page 94.

In an interview People magazine, David Corenswet, the man who will be Superman when the movie flies into theaters next month, revealed a family connection between him and the creator of the Choose Your Own Adventure series of books.

Cornswet’s grandfather, Edward Packard, came up with the idea for the books and even wrote some of them. According to Corenswet, his grandpa, now 94, came up with the concept “telling bedtime stories to my mom and my aunt and my uncle. As he described it, he ran out of ideas, and so he just started asking them to come up with the next idea.”

In a 1981 interview he gave to the New York Times, Packard said, ”That night in 1969 when I asked my girls what Pete, my mythical hero, should do next in the story,” Mr. Packard said, ”they each chose something different. On the train the next day, I thought, ‘What would happen if you wrote both endings?’ ”

Packard took the idea and put it into a book called The Adventures of You on Sugar Cane Island, but after shopping it to publishers, he found no takers. So he found a small publishing house that ran a limited series of novels and the books started to sell.

Over the years, the first book then became one in a series, and that series has since sold hundreds of millions of copies and have been translated into dozens of languages, according to Publisher’s Weekly. 

Having grown up with this family legacy, Corenswet told People there was no “single moment when I realized that that was a really big deal. But it’s always fun having somebody mention them. The books come up one way or another, and I get to give him credit,” he said.

Naturally, the Man of Steel-to-be was an avid reader of his grandfather’s creation. “I read them growing up. Anytime we would visit his house, they’d be around. And they’re amazing books,” he says. And he applauds his grandpa’s sometimes devious approach to the reader’s supposed free will when choosing the page to turn to.

“You think you’re making the right choices in the Choose Your Own Adventure books, but my grandfather very cleverly would sometimes make it so that if you feel like you’re making all the right choices, that doesn’t mean that you end up in an ending that you like,” he says.

Corenswet is poised to play both a comic book character and a journalist in his breakout role as Clark Kent/Superman in James Gunn’s superhero epic, due out July 11th.