This animated series is based on Marc Brown's best-selling books about Arthur Read, an eight-year-old aardvark, his sister D.W., and their f amily and friends. When "Arthur Babysits" the "terrible' Tibble twins, he gets more than he's bargained for. In "Arthur's Cousin Catastrophe ," Arthur spends most of the family reunion avoiding his cousin, only to find out that she's changed into someone more likable than he remem bered.