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.
Did You Know?
Bart Allen is the future grandson of Barry Allen, AKA the flash. He travels back in time to save his grandfather. See more
Apparently the Kroloteans were snatching humans to use as guinea pigs. They were hoping to find something Something inside us. Something inside us.
There's no English word for it. The nearest translation is... meta-gene.
What's a meta-gene?
Never met-a-gene I didn't like!
Young Justice Theme
Written by Kristopher Carter, Michael McCuistion, and Lolita Ritmanis
Performed by Kristopher Carter, Michael McCuistion, and Lolita Ritmanis See more