14. 'The Good Dinosaur' (2015)

Perhaps one of the more serious stories in the Pixar inventory, this coming-of-age tale about an Apatosaurus and his human friend Spot trying to return home didn't catch on nearly as much as Pixar's other release in 2015, "Inside Out."

Burnout may have been at play here, but mostly Pixar challenged its core audience with a darker story than they were used to.