Deep Discount: The Flash: The Complete Fourth Season (DC) on Blu-rayThe combination of a particle accelerator explosion and lightning strike imbues young Central City forensics cop Barry Allen (Grant Gustin) with super-speed, and he uses his newfound abilities to combat metahuman menaces threatening his town, as well as to unearth the truth about his mother's mysterious slaying. Lively, popular take on the DC Comics hero from The CW co-stars Candice Patton, Tom Cavanagh, Danielle Panabaker, Carlos Valdes, and Jesse L. Martin 23 episodes on 4 discs. 23 hrs. Widescreen; Soundtrack: English; featurettes.