From Doctor Who in the 1960s, to the more recent Heroes and Lost a select group of television series with strong elements of fantasy has achieved cult status. Focusing on eight such series, this work analyzes what makes these programs unique, and what they have in common. Examination of the interaction between the series' creators, studios and fans provides further insight into the series' lasting impact. Included are assessments of the strategies used to promote the series' appeal; an explanation of "transmedia" storytelling and its influence on the television fantasy genre; evaluations of how viewers have shaped cult texts and how greater audience acceptance encouraged creators to develop challengingly complex long-form dramas; and descriptions of changes within broadcasting that have enabled "telefantasy" to transcend niche status and enjoy prominence and popularity.