Crystal was originally asked to voice Buzz Lightyear in "Toy Story" (1995) but turned it down, a decision he later regretted due to the popularity of the series. Crystal later went on to provide the voice of Mike Wazowski in the blockbuster Pixar film "Monsters, Inc." (2001), and reprised his voice role in the prequel, "Monsters University", which was released in June 2013. Crystal also provided the voice of Calcifer in the English version of Hayao Miyazaki's "Howl's Moving Castle" (2004).