2.03 "Bloodlust"

The Winchester brothers enjoy Dean's new baby: a shiny newly restored car, while checking out a report of two recent human deaths and over a dozen split-open cows in the small town of Red Lodge, Montana. The local sheriff laughs at Sam and Dean's idea that a cult is behind it, claiming it happens naturally in the sun. But when Sam and Dean sneak into the morgue under false pretenses, they find a victim that has retractable vampire fangs. They catch black demon hunter Gordon Walker, who claims to be a friend of their late father and having made both kills after six months of vampire chasing started years before to avenge his sister who was killed by a vampire. Dean confesses to him he misses his seemingly unstoppable dad desperately. The boys are just in time to save Gordon from another vampire, but Ellen Harvelle warns Sam that Gordon is capable, but too dangerous to work with. Returning to the motel, Sam is knocked down and kidnapped by the vampires led by Eli and Lenore, who claim their kind feeds on only cows. Being released unharmed, Sam believes them, but feels Dean's fist for forsaking their mission and suggesting Dean joins Gordon as a poor substitute for father. Then Gordon goes after the nest alone, anyway...