Chloe O'Brian hacks away to assist Jack Bauer and Agent Renee Walker as they twist and turn through metro Washington, DC, in a race against time to detain Dubaku. Meanwhile, the panicked FBI and the distraught First Family grapple with the recent developments involving turncoat agents. Guest Cast: Sprague Grayden as Olivia Taylor; Peter Wingfield as Emerson; Issach De Bankole as Ule Motobo; Tonya Pinkins as Alama Motobo; Hakeem Kae-Kazim as Dubaku.Nothing about Aaron Pierce, who surely must still be keeping his eye on the estranged first daughter. 9 p.m. Monday. Fox.