Alex explains that she thinks she made a mistake by making a one night stand with a strange woman, thinking it goes against the awesome thing she had with Maggie.

Kara comes and wonders, why Alex is like this. Sara goes on the lift and thinks there's not going to be a thing between the two. She asks is Alex okay, and she claims she is. Alex comes back to the Labs, and meets Sara. Once they disconnect Firestorm and Martin leaves, Jax feels he no longer will have what he really wants: Stein, calling him the closest thing he has for a father. Jax finally reveals, why he is acting the way he does. Stein comes and asks to speak with Jax alone. Felicity explains that while she loves Oliver, she is afraid that history will repeat itself, as she got shot after their last engagement in ' Dark Waters'.Д¬aitlin, Wells and Jax try to come up with a way to track the Nazis, but it's not going so well, since Cisco is out of commission. Oliver comes, and he talks with Felicity, why she refused his proposal. They kiss, indicating they are married on Earth-X.ДЇelicity calls Curtis and has him run a search for dimensional vortices supported with S.T.A.R. He leaves, and Kara encourages Oliver to trust in their plan, as he made it. Eventually they calm down, and Oliver orders Thawne to find the Prism. Oliver slams Thawne to a pillar, forcing Earth-X Kara to step in, when Thawne threatens to rip Oliver's heart. Thawne is upset about how their plan is not going as it should. Oliver tries to get through Tommy, but when Tommy manages to fool Oliver into thinking he was forced into this by the FГјhrer, he kills himself with cyanide capsule.Д®obard Thawne meeting with Kara and Oliver from Earth-X.Д®arth-X Oliver receives a signal that his best friend, Tommy, is dead. Hitler continued his brutal reign until he died in 1994. Stein realizes that on Earth-X the Nazis developed the atomic bombs before Americans, and used them to annihilate their enemies, thus winning World War II.

He then shows that Earth-X history followed same events as Earth-1, but with a critical difference. It doesn't have an official designation, because it is so horrible no sane person would ever travel there. Wells then says that there is a 53rd Earth, which is called Earth-X. Kara says that there are 52 Earths, but none of them has a Nazi regime. Barry then thinks they are from another Earth. Sara, Jax and Stein come up with a theory of time traveling Nazis, which could mean they are anachronisms, but it doesn't make sense, since they crashed Barry and Iris' wedding. Oliver has a private talk with him, while others try to determine, where does these Nazis come from. The Earth-X Prometheus is revealed to be Tommy Merlyn. Tommy Merlyn, the Prometheus of Earth-X, talking to Oliver Queen.

Matt Letscher as Eobard Thawne/Reverse-Flash (archive footage).

Adolf Hitler as Hitler (archive footage).

Melissa Benoist as Kara Danvers/Supergirl and Kara/Overgirl.

Colin Donnell as Tommy Merlyn/Prometheus.

Franz Drameh as Jefferson 'Jax' Jackson/ Firestorm.

Harrison 'Harry' Wells and Professor Eobard Thawne/Reverse-Flash

Caity Lotz as Captain Sara Lance/White Canary.

Victor Garber as Professor Martin Stein/ Firestorm.

Juliana Harkavy as Lieutenant Dinah Drake/Black Canary.

Stephen Amell as Oliver Queen/Green Arrow and FГјhrer Oliver/Dark Arrow.

Earth's mightiest heroes - Green Arrow, Supergirl, The Flash and White Canary - lead their teams into battle to save the world. All of the superheroes band together with help from their super friends like Citizen Cold, The Ray, Felicity Smoak, Iris West and Alex Danvers to take on their most formidable villains yet. Synopsis Barry and Iris's wedding brings the gang together, but things go awry when villains from Earth-X attack the ceremony.

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