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Lockdown is the twenty-second episode of the eighth season of ER, and the one hundred eightieth episode overall.
Guest Stars: Paul Hipp (Craig Turner), Alison La Placa (Female Lawyer), Abraham Benrubi (Jerry), Deezer D. (Malik), Yvette Freeman (Haleh), Lily Mariye (Lily), Monte Russell (Zadro), Christopher Birt, Larry Clarke (Male Lawyer), Kingston DuCoeur, Dee Freeman (Dr. Lutz), Marjorie Lovett (Marge Satterfield), Harrison Page (Stan), Curtis Peek, Nestor Serrano (David Torres), Heidi Swedberg (Robin Turner), Jayne Taini, Mekhi Phifer (Dr. Gregory Pratt), Lynn A. Henderson (Olbes), Demetrius Navarro (Morales), Ken Abraham (Sean), Frankie Jay Allison (Frankie), Michelle Bonilla (Harms), Art Frankel (Ralph Meyers), Dee Anne Helsel (Deanne), Miranda Kwok (Kristen), Alice Lo (Lenore Fong), Charles Martiniz (Eddy), John C. McDonnell (Rick), Kristy Munden (TV Anchor), Lisa Picotte (Pregnant Woman), Raoul Rizik (Raoul), Bella Shaw (Robinson), Scott St. James (Drasnin), Isidra Vega (Marta Guzman), Sean Virzi (Adam 1), Alex Virzi (Adam 2), Mitchell Virzi (Adam 3), Emily Wagner (Pickman)
Carter and Abby tend to two kids who exhibit signs of smallpox which causes the ER to be placed under lockdown; Chen and Pratt are placed in quarantine with a homeless man named Stan when they begin developing symptoms; the ER has their hands filled with senior citizens injured in a bus accident and disgruntled patients who demand to know why they can't leave the ER which ends up causing a riot.