Joshua Williamson talks Flash’s mythology and what its like seeing his creations on TV

Joshua Williamson’s multi-year run on The Flash has led to massive changes for the Scarlet Speedster. We talked to the bestselling writer about the responsibility a writer feels on a legacy book, what the future holds for his creator-owned book Nailbiter, and he puts on his fanboy cap to tell us the dream DC-Marvel crossover he’d want to read.