Former Happy Days star Henry Winkler's literary career has been given a big boost - his children's book franchise, Hank Zipzer: The Worlds' Greatest Underachiever, is to be turned into a Bbc series. Winkler, who based the tales on his experiences growing up with dyslexia, will star in the show, which is set to air in Britain next year (14). The actor/author will play a teacher called Mr. Rock in the 13-part series.