Jerry Lewis, who starred in the original 1963 comedy, provides the voice of Professor Julius Kelp in this wildly funny animated sequel. This time around it's the nerdy scientist's grandson, a wunderkind inventor, who has a notion to try the potion that radically alters the imbiber's personality. Other voice talent includes Drake Bell, Tabitha St. Germain, Brittney Irvin and Andrew Francis. Directed by Paul Taylor. Lewis is also credited as one of the film's producers.