Curse of Darkness and several other entries in the long-running lineage.
While season 4 shares some of the same minor shortcomings that occasionally blighted seasons 1, 2 and 3, it also amplifies the good work seen in those same seasons, creating a storyline that makes excellent use of the core components of Konami's property whilst simultaneously weaving a plot that is both dark and engaging in equal measures.
Before we continue, be aware there are spoilers in this review if you've yet to watch any of the previous series, as well as mild spoilers for season 4. You have been warned!
Season 4 picks up from the events of the previous season, with Trevor and Sypha wandering the countryside hunting monsters and generally trying to fathom where the next threat will come from. Alucard, meanwhile, has retreated to his father's castle to brood – an understandable response when you consider how he was so cruelly betrayed at the close of season 3.