After weeks of sexual assault allegations from a parade of women, Bill Cosby is fighting back. The 77-year-old comedian filed a lawsuit today against Judy Huth, who claims Cosby forced her to perform a sex act in 1974 at the Playboy Mansion, when she was 15. In documents obtained by ABC News, Cosby alleges that not only is Huth lying but that she filed the lawsuit after failing to extort money from him. Cosby is asking a judge to dismiss the lawsuit and is seeking monetary damages from Huth and her attorney.

In his filing today, Cosby says Huth's lawyer approached the comedian's attorney, Marty Singer, last month and made "ominous references" to 'criminal penalties.'" According to the lawsuit, Huth's lawyer demanded $100,000 for her silence, and later increased the amount to $250,000 as additional women came forward.