Plot
After crashing into Flash and Kid Flash in the timestream, Rip Hunter traces Supernova to Central City. There, the heroes discover that Supernova is working with a former Time Master. When the Flashes disappear, Rip Hunter figures out that they are in Central City on the night when lightning strikes Barry Allen. As the time masters battle, Booster fights Supernova, and discovers that it is his father using the suit. Booster ensures that Barry Allen becomes the Flash, and Rip and Booster head back into the timestream to their next mission, preventing the crippling of Batgirl.