6. Heroes
The third and final TV series to make this list bears more of a mixed reputation, but I feel it has great potential should it receive the Telltale treatment. Heroes was a series that debuted with strength only to squander the goodwill it had earned amongst fans in the seasons that followed. In spite of its unravelling quality and coherence, it was a show with a really compelling tone and some fascinating mythology.
Like Firefly, there’s always the possibility of former cast members dropping in for cameos but the flexibility of Heroes’ superpowered-people-with-human-dilemmas concept is more than enough to sustain its own Telltale adventure.