This episode is part of a larger crossover series, Armageddon.
"Armageddon, Part 1" is the first episode of the eighth season of The Flash, and the one-hundred-fifty-second episode overall. It aired on November 16, 2021.
The episode is the first part of the five-part crossover, Armageddon.
When a powerful alien threat arrives on Earth under mysterious circumstances, Barry, Iris and the rest of Team Flash are pushed to their limits in a desperate battle to save the world. But with time running out and the fate of humanity at stake, Flash and his companions will also need to enlist the help of some old friends if the forces of good are to prevail.[src]
There is a new Royal Flush Gang consisting on a group of meta-humans. Previously there were two gangs: one that consisted on a family of regular robbers who operated in Star City before Oliver Queen stopped their criminal activities, and a second gang consisting of bikers who were arrested by the Flash.
This new group lacks an Ace, the fifth member of the gang.
From time to time, 'Royal Flush Gang' uses quotes from the song 'The Gambler' sung by Kenny Rogers, like when Queen says 'I Know How to Fold them.'
Ray states that he hasn't met with Nate Heywood in a while due to the latter rarely being in the present day, which might be a reference to how the Legends are currently lost in time; unknown to everyone, the Waverider has been destroyed.
The newspaper article about the Royal Flush Gang seen in Barry's flashback was written by Mason Bridge.