It's April 28 - the day before the prophesized flashforward date - and as the world waits to see if their future visions will come true, Mark must do everything in his power to protect Gabriel, who is the bridge between Dyson Frost and the Global Blackout; Aaron locates his daughter's captors and puts his life on the line in order to rescue her; Janis is tasked with killing a fellow agent; and Simon comes face to face with the head of the nefarious organization that may be responsible for the blackout.