- "My name is Barry Allen, and I am the fastest man alive. A freak accident sent a lightning bolt into my lab one night, dousing me with electricity and chemicals, gifting me with superspeed. Since then, I've used my powers to fight the good fight, protecting my city, my world, and my universe from all manner of threats. I've stared down crazed speedsters, time-traveling techno-magicians, and every sort of thief, crook, and lunatic you can imagine. With the help of my friends and my adopted family, I run S.T.A.R. Labs, a hub of super-science, and use it as a staging base to keep Central City safe from those who would cause it harm. I've traveled to not one but two different futures, and I've seen the amazing heights to which humanity will soar. In the present, I do everything I can to get us there. I am... The Flash."
- —Opening passage
When the Green Arrow needs help tracking down a sinister bomber in Star City, speedster Barry Allen is out the door in a flash. But as the Flash saves the day with his friends on Team Arrow, a huge dimensional rift appears over his hometown of Central City - and thousands of refugees with superspeed come pouring out. Can the combined skills of Team Arrow and the Flash's friends at S.T.A.R. Labs manage the chaos long enough to stop the rift from tearing their universe apart?. This exciting first installment in the new crossover trilogy promises to be one of the most action-packed reads of the season. Supergirl, Superman and the heroes from will be joining in on the fun in books two and three of this can't-miss trilogy.
- This book is the first of a trilogy, but the story takes place after , which has its own continuity with Barry Lyga's books.
- It is confirmed that the Cisco of 's continuity frequently talks with the book's Cisco and told him certain events from his timeline, such as H.R.'s death, fighting the Thinker, and meeting Barry's future daughter.
- The Crime Syndicate made their first physical appearance.
- When a fire department officer responded to Iris, he designed himself to be "FDCC Ladder Company Number 52", which is a reference to the New 52.
- Due to Flashpoint never occurring, some events which happened in the show's continuity did not happen in the book's continuity, but they do share some similar events:
- The Earth-X invasion still happened but its details are unknown.
- Barry and Iris got married at some point.
- Barry came face-to-face with The Thinker but compared to the show's continuity, DeVoe was defeated easily due to H.R.'s help.
- Oliver came face-to-face with Ricardo Diaz, but he had help from Barry to stop him.
- Oliver mentioned that without Barry's help, he could have been in jail, a nod to the fact that Oliver turned himself in to the F.B.I. in the show's continuity in exchange for their help in capturing Diaz.
- Wally West joined the Legends, though only because Barry asked him to tell them about Flashpoint.
- The Legends still found a way to work with the Time Bureau.
- Brie Larvan was still defeated after attempting to steal from Palmer Technologies but remained in a coma.
- Sara Diggle was never erased from existence.
- When Cisco criticized Owlman's name, he said, "I mean, if you want to be really silly, they could have gone with Bat-" before being cut off by Oliver. This of course is an allusion to Batman, who is the alter-ego of Bruce's other doppelgängers.
- This is the first book in which the Legends make a full appearance.
- The Flash: Green Arrow's Perfect Shot at Amazon.com
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