Pixar's Elio has had the worst-ever box office opening for a film from the animation studio. It's part of a wave of original family cartoons failing at the box office.

Pixar's Elio opened with just $21 million at the box office, the studio’s weakest debut ever, and Wall Street took notice. While critics were relatively kind (84% on Rotten Tomatoes), the financial stumble wasn’t just about the movie itself.

Disney’s animated adventure “Elio” failed to lift off at the box office, underscoring Pixar’s continued struggle to launch original films. After all, Pixar hasn’t stumbled with sequels. This time last year,