Slutet på Incredibles var aldrig menat som en pekare till en uppföljare. Som Brad Bird - som skrev och regisserade filmen - berättade CinemaBlend :
How did that Pixar adventure end? The family was leaving Dash's track meet, when suddenly, a former nemesis -- The Underminer (John Ratzenberger) -- bursts out of the pavement and declares war. But, in an exclusive interview, Bird told CinemaBlend that this wasn't always his planned ending, and he explained:
I had another ending that was kind half baked, meaning not really finished in my mind. And I knew that the way to classically end a film is show people getting back in the saddle and riding off into the sunset. But I resisted a little. And finally, my head of story on that film, a guy named Mark Andrews, said, 'Come on, you know what you want!' And I was like, 'All right, all right.' So I thought, it's a way of showing they're together, and that they're going to face whatever obstacles as a group, now embracing their superpowers. So I thought that's what was important to communicate.
I wouldn't have set it up so everyone wonders who The Underminer is. No, no. It was just, this will be a satisfying ending to this film. And if there's never another one, we get that the family's together, they're embracing their powers, and they're fighting whatever obstacle comes their way.