Innocent lives remain in the line of fire as this terrifying day draws to a close. Jack is faced with an unthinkable situation while his perpetually imperiled daughter, Kim (guest star Cuthbert), gets involved. Meanwhile, the imminent threat stokes the heated rivalry between Chloe and Janis. Guest Cast: Jon Voight as Jonas Hodges; Elisha Cuthbert as Kim Bauer; Sprague Grayden as Olivia Taylor; Glenn Morshower as Aaron Pierce; Will Patton as Alan Wilson; Rafi Gavron as Hamid Al-Zarian; Omid Abtahi as Jibraan Al-Zarian.Unthinkable situation? Next week brings the two-hour season finale. 9 p.m. Monday. Fox.