More details of the upcoming Walking Dead spinoff have emerged, filling in the lines sketched out by the tense trailer AMC released in early March. Showrunner Dave Erikson and creator Robert Kirkman opened up about the character relationships and story arcs that will build the new series, Fear the Walking Dead. Erikson, who produced Sons of Anarchy and Low Winter Sun, told The Hollywood Reporter that the new series, set in Los Angeles during the period of Rick’s coma, is “more of a parallel story than a prequel…It’s kind of its own strange, hybrid thing.” And while the new series takes place at the beginning of that flu-like outbreak, the origin of the illness will remain unexplained. “For [Kirkman], it’s never been about what caused it; it’s always been about the impact it has on people.”