Became the voice of Stitch almost by accident. The character was originally intended to be silent, but when they decided for him to talk, Sanders recorded a few lines, and the filmmakers got so used to his voice that they cast him in the role.
The movie Lilo & Stitch (2002) was based on an unpublished book he wrote in 1985.
Toothless' appearance in How to Train Your Dragon (2010) was partially based on Stitch from Sanders and Dean DeBlois' earlier work Lilo & Stitch (2002), and the two movies follow a similar story.
His first live-action work as well as his first solo directorial effort was The Call of the Wild (2020).