Just finishing its first season on BBC America is Primeval, a british sci-fi adventure series that shows how monster-of-the-week is really done.
In recent years, science fiction and fantasy shows have generally tried to steer away from plotlines that involve creatures appearing, then terrifying and/or eating bystanders, and then being dispatched at the end of the episode once the cast has figured out the creatures’ main weakness. This plot formula is only for the start of season one, the thinking goes, when audiences need self-contained stories to introduce them to the cast and the show’s milieu. The real meat happens later, as multi-episode arcs and more complex character development are brought in, and monster-of-the-week episodes, with their limited formula, go to the bottom of the story pitch pile. Primeval explodes this thinking by having a show built firmly around the monster-of-the-week device, while still advancing engaging season-length arcs and furthering clever character development.