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Gut Reaction is the eighteenth episode of the fourth season of ER, and the eighty-eighth episode overall.
Guest Stars: Abraham Benrubi (Jerry), Ellen Crawford (Lydia), Trevor Morgan (Scott Anspaugh), Bellina Logan (Kit), Robert Ellenstein, Davenia McFadden (Mrs. Bevins), John Walcutt (Cancer Specialist), John Aylward (Dr. Donald Anspaugh), Paul McCrane (Dr. Robert Romano), Frances Sternhagen (Millicent Carter), William H. Macy (Dr. David Morganstern), Ron Trotta, Megan Cole (Pathologist), Conni Marie Brazelton (Conni), Laura Ceron (Chuny), Deezer D. (Malik), Lily Mariye (Lily), Gedde Watanabe (Yosh), Brian Lester (Dumar), Michele Morgan (Allison Beaumont), Perry Anzilotti (Perry), Lauri Johnson (Oncology Nurse), Dinah Lenney (Shirley)
Benton clashes with Dr. Morgenstern after an operation goes wrong; Dr. Anspaugh's son, Scott makes a decision about treating his cancer; Mark organizes the ER's annual banquet; Anna discovers that she is a potential bone marrow donor for a patient; when the supplies for Carol's free clinic are repoed, Carter confronts his grandmother about why she cut off the clinic's funding.