Barry and Dark Flash begin to accelerate fighting while Oliver pulls out an arrow of Kryptonite to shoot Overgirl. Dark Arrow orders Thawne to take the prism and move away while Overgirl uses laser vision to cut the beams of the nearby skyscraper under construction.
Kara holds the heavier top while Barry and Oliver work to stabilize the rest of the skyscraper, allowing the evil doppelgangers to escape.
Back at STAR Labs, Felicity and Wells tell the rest of the team that the stolen prism would allow them to create a neutron bomb. Barry enters with the arrow that Oliver used to shoot Overgirl in hopes that the team could use the blood to track Overgirl's whereabouts.
Felicity and Caitlin work with Wells to start using blood to track Overgirl, and they say they should have a location soon.
Barry and Iris are talking about Thawne's return when Oliver comes in and tells them about his endless love. Felicity enters to tell them that they have a location in the Earth-X villains.
The heroes begin to adapt to converge on the spot while Felicity and Iris are left behind to watch. Mick comes complaining about the lack of mustard in his sandwich, he has stayed behind while the other heroes are going to stop the bad guys.
The group begins to fight with the Nazi henchmen while Barry and Kara work to defeat their counterparts. Oliver and Sara wonder aloud where Dark Arrow is and see it go back on the STAR Labs sign.
In STAR Labs, Wells encounters Dark Arrow in the basement and leaves running from the others warn.
The group of heroes is still in the warehouse fighting with Nazi henchmen, trying to prevent Earth-X villains from carrying out their Central City leveling plan.
Mick tells Iris and Felicity to hide and tell Caitlin will become Killer Frost – they will try to shoot down Dark Arrow.
Back at the warehouse, Oliver tries to shoot another kryptonite arrow in Overgirl, but this time, she catches him and breaks it in half.  Mick approaches Dark Arrow and starts firing with his hot air gun. He is able to distract Dark Arrow enough for Caitlin to sneak up and freeze his hand in his bow. Dark Arrow is able to break free, but the rest of Team Arrow – Curtis, Dinah and Rene – appear to help.
The group in the warehouse can stop all the henchmen, but they are approached by a green robot that dazzles most of the team.
The team awakens to discover that everyone has been held by the Earth-X group with necklaces that muffle energy. villains.
Overgirl enters to address the team
Here we find the final game of Earth-X
Iris and Felicity are walking in the lower room of the STAR Labs when they see the Nazis putting the knocked out members of Team Arrow in the STAR labs with cells.
The warehouse heroes, Oliver, Barry, Sara, Stein, Jax, Kara and Alex, wake up in a concentration camp on Earth X.