Aliens attack Central City, Barry speeds over to Star City to ask the Green Arrow for the help to stop alien invasion. Realising that the war against the dominators is bigger then what they have expected, They tracked the Legends of Tomorrow, and Barry and Cisco created a breach to bring back a secret weapon Supergirl. Once all of them were assembled, they come up with a plan but a shocking secrete is revealed related to flashpoint.
This is again one of the crossover episodes in the DC Universe. When aliens invade Central City, Barry is made to seek help from the heroes of Earth-38. Thus, Green Arrow and his team of the Legends and Supergirl begin training in order to defeat the aliens. Barry tries to gain his team’s trust once again. There is a lot of things happening in this episode. From the juxtaposition of characters to the mishaps and tumult due to the maneuvering of timelines. What happens next? Watch this episode to unravel the plot.