What a menacing title. This episode is the debut of Xavier St. Cloud, one of the most memorable bad guys in this series. Though admittedly, he's a lot more interesting in his later episodes; between that and various inconsistencies in this episode, it seems like he was intended to be a one-off and got brought back due to fan demand.
Xavier is the only villain to appear in seasons 1, 2, 3, and 4... as far as I know.



















