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Double Blind is the twelfth episode of the fifth season of ER, and the one hundred fourth episode overall.
Guest Stars: Abraham Benrubi (Jerry), Jorja Fox (Dr. Maggie Doyle), Cress Williams (Off. Reggie Moore), Bill Henderson (Charley Barnes), William Bumiller, Terri Hanauer, Dick Miller (Mr. Ackerman), Ron Fassler, Paul McCrane (Dr. Robert Romano), Penny Johnson Jerald (Lynette Evans), Valerie Mahaffey (Joi Abbott), Carl Lumbly (Dr. Graham Baker), John Aylward (Dr. Donald Anspaugh), Conni Marie Brazelton (Conni), Laura Ceron (Chuny), Deezer D. (Malik), Elizabeth Barondes (Heather), Emily Wagner (Pickman), Demetrius Navarro (Morales), Janni Brenn (Nurse Kass), Kyle Chambers (Ricky Abbott), Alma Yvonne (Seminar Woman #3), Lisa Brounstein (Wanda Jean Meredith), Rachel Grate (Donna), Kerri Higuchi (Student #2), Kevin McClatchy (Fred Danziger), Hamilton Mitchell (Guy from Chairs), Kate A. Mulligan (Riggs), Paul J. Palmer (Medical Student), Netfa Perry (Seminar Woman #1), Alex Plummer (Aaron Rosen), Malayika Singley (Seminar Woman #2), Brian Turk (Michaels), Kenneth Alan Williams (Gabriel)
Doug jeopardizes a pain medicine study by giving some of the drug to Joi's son, Ricky; when Mark finds out about it and tells Weaver, the two of them decide not to tell Anspaugh in order for the hospital to keep getting money in research; Lucy begins her surgical rotation with Benton and helps him out with a patient who claims to be 140 years old; Mark defends paramedic Pickman when she inadvertently leaves a man with a serious injury at the scene of an accident and decides not to go through with the NASA program.