Yang Haoliang, an evergreen singer in the past, accidentally discovers that some is using his identity to deceive others. He asks his son, Yang Shiyue, to find out the truth. Yang Shiyue ends up teaming up with his fake father.
World's Greatest Dad is a 2009 American black-comedy drama film written and directed by Bobcat Goldthwait and starring Robin Williams, Daryl Sabara and Alexie Gilmore. The film was released on July 24, 2009, on video on demand providers before its limited theatrical release on August 21, 2009.