De vier overlevenden beginnen vreemde symptomen te manifesteren, maar de poging van Eph en Nora om hen in quarantaine te plaatsen wordt gedwarsboomd wanneer men tracht de waarheid te verhullen.
Gastrollen:
Jack Kesy(The Master), Natalie Brown(Kelly Goodweather), Adriana Barraza(Guadalupe Elizalde), Robin Atkin Downes(The Master (voice)), Jess Salgueiro(Sherry), Robert Maillet(The Master), Daniel Kash(Dr. Everett Barnes), Roger Cross(Reggie Fitzwilliam), Joe Pingue(Caldwell), Jonathan Potts(Captain Doyle Redfern), Steven McCarthy(Gary Arnot), Nikolai Witschl(Ansel Barbour), Leslie Hope(Joan Luss), Drew Nelson(Matt Sayles), Francis Capra(Crispin Elizalde), Ben Hyland(Zach Goodweather), Inga Cadranel(Diane), Jacqueline Byers(Cleo), Jean Pearson(Germaine), Egidio Tari(NYPD Cop), Ali Momen(Dr. William Lester), Regina King(Ruby Wain), Maria Ricossa(Margaret Pierson), Lindsay Owen Pierre(Det. Marc Weber), Amanda Schik(Mindy), Isabelle Nélisse(Emma Arnot), Peter Spence(Richard)