After the revelation at the end of Season 1 that Guillermo (Harvey Guillén) is a descendent of famed vampire hunter Van Helsing, What We Do in the Shadows is ready to take that character arc to the next level. In the third episode of Season 2, "Brain Scramblies," Guillermo made some new friends that could pose quite a bit of danger to his vampire masters.

"He's looking for virgins, and he's run out of other groups that he thinks will have a lot of them so he goes to a meeting of the Staten Island Mosquito Collectors," executive producer Paul Simms explained to GameSpot and other outlets during a visit to the set of the show. "And once they ask him some questions, they reveal that there are actually a bunch of vampire hunters, and that's their cover."

This group of vampire hunters is led by a man named Derek, played by The Office alum Craig Robinson. Speaking to GameSpot, Robinson described the character as a "militant mosquito hunter," adding, "He's all about shutting down the vampire nation."