William Watts Biggers, co-creator of the cartoon “Underdog,” has died at age 85. Biggers died unexpectedly on Sunday at his home in Plymouth, Massachusetts. “Underdog” premiered on NBC in 1964. Underdog became a Macy’s Thanksgiving Day Parade balloon and was also turned into a live-action film in 2007. He is survived by Victoria Biggers, his son, W. Watts Biggers, Jr., and longtime girlfriend Nancy Purbeck. Read more below.