on "the simpsons," which premieres on the fox network in 1989. >> matt groening created these characters and this family, but the universe that the simpsons exist in -- the town, the nuclear power plant, mr. burns, all of these different characters... sam simon was the driving force behind that. >> but in 1993, after four trailblazing seasons, sam decides he wants a life outside of television. before quitting, he negotiates a deal giving him continuous credit as an executive producer and a share of the show's annual profit, to the tune of $30 million a year. sam, now twice divorced with no children, turns his energy to what becomes his calling in life -- saving animals, especially dogs. in 2002, at the cost of several million dollars, he creates this lavish, sprawling dog shelter in malibu. one of the neglected pooches that end up at sam's shelter is a 6-month old cane corso, also known as an italian mastiff, a breed some people refer to as "a pit bull on steroids." the big canine is quickly deemed too aggressive to stay at the shelter. so sam takes him home and names him columbo, after