The Flash: Armageddon (Part 1)

Part one of five. When a powerful alien threat arrives on Earth under mysterious circumstances, Barry, Iris and the rest of Team Flash are pushed to their limits in a desperate battle to save the world. With time running out and the fate of humanity at stake, they also need to enlist the help of some old friends if the forces of good are to prevail. Return of the superhero adventure, starring Grant Gustin