Family life for the Simpsons is a chaotic blend of cheeky outbursts and consequent mending, as Homer (voiced by Dan Castellaneta) and Bart (Nancy Cartwright) -- unwittingly or not -- undermine Marge (Julie Kavner) and Lisa's (Yeardley Smith) good intentions. Bart finds joy in being a constant source of trouble. Homer earns his keep by falling asleep at the controls of Springfield's nuclear plant and drinks beer after work with fellow barflies who make the cast of Cheers look tame. But within this dynamic are heartfelt scenes and clever plot lines that make The Simpsons a classic.