In a sense, Veronica herself has been there all along, as a potentiality and sometimes more: canonically revived in a 2014 Kickstarter-funded feature film and two subsequent novels co-authored by series creator Rob Thomas, and in the unofficial shared dream that is fan fiction. “Veronica Mars” is back, again, courtesy of Hulu’s long-coming fourth season of a series born in 2004 on a network - the UPN - that no longer exists.