Sleek Rat, the Challenger () is a 2013 Chinese wuxia-mystery television series based on the 2006 novel The New Legend of Bai Yutang () by Tan Ge (), 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.
The series was first broadcast in Malaysia on TVBS-Asia on January 30, 2013, and in Taiwan on March 3, 2013.