This Is How Jack-Jack Became The Breakout Star Of 'The Incredibles 2'

“I wish we had done more recording,” said Tony. “I didn’t expect that it would last.”

Eli estimates he lost the ability to make Jack-Jack sounds when he was 9 or 10 years-old. “Once the voice cracked, that was the end of that,” said Tony. “Yeah, unfortunately,” echoed Eli.

“The Incredibles 2” takes places just a few months after the original film, but the passage of time has had curious effects for the cast. Dash, the middle child of the superhero family, was previously voiced by Spencer Fox. Ten-year-old Huck Milner was brought in this time. At the “Incredibles 2” premiere, Milner was confused meeting the voice of his fictional younger brother.

“He was like, ‘Wait, you’re older than me,'” recalled Eli, chuckling. “I was like, ‘Yeah, buddy.'”

For Tony, the years meant a second chance to animate Jack-Jack, to improve his facial gestures and give him some powers that weren’t technically possible 14 years ago. As the development went on, Jack-Jack got more and more prominent.

“There was no real limit to what could be done,” said Tony. “It was one of those things where it was: Why can’t he do this?”

And for Eli, it’s his first chance to revel in being Jack-Jack. Even if not everybody thinks it’s him.

“All my friends didn’t believe it at first,” said Eli. “They’re like: ‘What? You did a baby voice?”