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A stranger appears within Mount Justice claiming to be a time traveler and the grandson of the current Flash (Barry Allen). The boy, Bart Allen/Impulse, soon gatecrashes the Garricks' wedding anniversary party and reveals his identity. The party is interrupted when they all learn that a villain called Neutron is on a rampage, and the Flash, Kid Flash, and Impulse head off to stop him. The Flashes defeat Neutron, and Impulse secretly administers a cure to Neutron's uncontrollable power. Through a nonlinear narrative, it is discovered that before Impulse embarks on his voyage to the present day, he bids farewell to Neutron, fully aware that the time travel is going to be a one-way trip. After he departs (and the events of the episode take place), Neutron reverts to normal, but is horrified to discover that the post-apocalyptic future around him remains unchanged. Meanwhile, Red Arrow and Cheshire travel to a League of Shadows base in Tibet where they finally find the original Roy Harper.
All Episodes - S02
EPS01
Five years after the Justice League were controlled by Vandal Savage, their time under his control comes back to haunt them. The Team has to take on alien invaders, start ...
EPS06
A stranger appears within Mount Justice claiming to be a time traveler and the grandson of the current Flash (Barry Allen). The boy, Bart Allen/Impulse, soon gatecrashes ...
EPS10
Aqualad meets the Light's partner and learns of their plans for Earth while Miss Martian's revenge backfires on her. Meanwhile, the team meets a new, seemingly unbeatable ...