The X-Files S05E12
Plot: After Mulder drives a stake through the heart of a would be vampire, he and Scully review what happened before they meet Assistant Director Skinner. Their recollection of the case is significantly divergent. They had gone to Texas to investigate a death by exsanguination and Scully thinks that someone is playing at being a vampire. Her autopsy finds a high level of chlorohydrate in the dead man's system. There's soon a second victim and she finds that both victims had eaten pizza. As she recalls it, she saved an incapacitated Mulder and tried to capture the culprit.
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