Denny is outraged when he is not permitted to board a plane because his name is on a “no-fly” list, and asks Alan for help suing Homeland Security.Meanwhile, Shirley and Vanessa defend a teacher who is accused of negligence when one of her students dies from anaphylactic shock in class.Denise becomes nervous when Alan begins to suspect she is sleeping with both Brad and Jeffrey, and Claire continues to help Clarence with his self-esteem issues.