Season 5 Episode 12 - Bad Blood 

After Mulder chases down and kills a young man whom he believes to be a vampire, Scully realizes that his fangs are fake. Faced with a lawsuit from the family of the man, they recount each of their sides to the story leading up to the event.
mots-clés: x-files, scully, mulder, full episode, the x-files, season 5, episode 12, 5x12, bad blood