Sleek Rat, the Challenger (白玉堂之局外局) is a 2013 Chinese wuxia-mystery television series based on the 2006 novel The New Legend of Bai Yutang (新白玉堂传奇) by Tan Ge (谈歌), starring Xu Honghao as "Sleek Rat" Bai Yutang, a knight-errant in 11th-century China. Many characters come from either the 19th-century novel The Seven Heroes and Five Gallants or the Generals of the Yang Family legends, but the story is completely new.