Colonel Bridges and two other medical officers come to the camp, looking for guinea pigs on whom to test a new anti-malaria serum. As they are a concert party the boys are expendable and therefore ideal. Williams bribes the men into having their shots by promising them beer but there are strange side effects as most of the company end up with swollen faces and Ashwood's hair starts to fall out. Williams exhibits signs of malaria but Bridges thinks it is psychosomatic and plans to shock him out of it by firing a gun. Instead he shoots himself in the foot.
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