Episode 6: Bloodlines
Takes place on February 28
A teenage speedster named Impulse arrives on Mount Justice from the future in a Time Machine, supposedly just to visit, and ends up confusing a lot of people. Impulse escapes Mount Justice and heads to Central City hoping to meet Barry Allen. Nightwing is able to contact both Barry Allen and Wally West about the imminent arrival of Impulse, but before Dick can finish, Impulse rushes in on Barry and his wife Iris West celebrating Jay and Joan Garrick's 70th wedding anniversary.
Impulse reveals that he is the future grandson of Barry and Iris, and that Iris is pregnant with his Aunt Dawn and father. Iris West receives a call from her boss that a supervillain is attacking Central City. Mysterious beings manipulate this supervillain named Neutron into wrecking havoc in Central City. Both versions of The Flash (Jay and Barry), Kid Flash, and Impulse work together to stop Neutron. Impulse rushes in, and while the others aren't present, uses a device to cure Neutron.
Elsewhere, Red Arrow and Cheshire, along with their daughter Lian, travel to a a Tibetan monastery in their search for the original Roy Harper. After fighting off an army of monastery guardians they finally locate Speedy and release him from stasis.
Having visited Barry, his original stated goal, Impulse climbs back into his time machine to return to the future. Nothing happens and it seems Impulse is now stuck in the present due to the machine's breakdown. We then flash-forward once again to the future Impulse came from, where it's implied originally Barry died that day and in time Neutron and others like him devastated the entire planet. Neutron himself was the one who built the capsule device that cured the villain in the past, and together with Impulse had planning all along to use the time machine to change the future for the better. Bart knew from the start that he would never be able to return home. Unfortunately, though Bart's actions save Neutron from 40 years of crime and destruction, the rest of the future is still in ruins.
Notes:
- Barry Allen's grandson from the future, Impulse (Bart Allen), is introduced. He was one of the three founding members of Young Justice in the comics, together with Robin (Tim Drake) and Superboy.
- Jay Garrick, the original Flash, also appears this episode.
- The original Roy Harper is reintroduced after last being seen in "Auld Acquaintance".
