You could argue that tonight's season finale of Supergirl was an episode four years in the making! Supergirl vs. Lex Luthor! Jon Cryer's version of Lex has proven to be a fan favorite and one that is potentially more dangerous than any other version of the character. His inherent magnetism combined with his ruthless nature lead to some incredibly shocking and frankly vicious moments! Of course, Lex wasn't the only one going all mad scientist, Brainy, having been recently rebooted by misguided Children of Liberty agents was certainly not acting like himself. If that wasn't enough, Ben Lockwood, having been out smarted and stripped of everything he loved was a man with nothing to lose. There was a lot to wrap up this season, here's how they did it:

1. 24 Hours Earlier: Just as we saw in the sneak peek earlier today, we see a flashback to when Kara and Red Daughter went up against each other in the capital. When she returns to Lex, it is Lex who suggests that Red Daughter go after Eliza. Next, we see only 6 hours earlier where Lex and Eve are preparing Lex's new weapon. Lex is capturing people and putting them into holding cells. He then tests his weapon and kills a guard savagely. Finally, only an hour before, we see Lex meet with the President of the United States. The president is worried that he should be in a bunker but Lex assures him it's fine. After Red Daughter thinks Kara is dead, she flies off to meet with Lex. When she gets there she is horrified to find out that the invasion was already over. Lex declares he is happy to be an American and turns his new weapon on Red Daugther.
2. Lex the Hero: Lex Luthor is named the new Secretary of Alien Affairs. He also donates a power grid to help power the damaged areas on the coast that the Kasnians hit. While at Catco, Brainy restores all of Kara's evidence against Lex that was wiped from Catco servers. He then nonchalantly says J'onn and Dreamer have been kidnapped. Lena and Kara freak out rightfully so but before they can really act, Lena is given an invitation to the White House where Lena, Lex and Lillian all arrive in the oval office. Meanwhile, J'onn and Dreamer team up with a few aliens on the other side of the trans-mat portal to create a diversion!
3. Luthor Family Reunion: While in the Oval office, Lex gloats to his mother and sister how he won. He talks about how he is using aliens as a new power source. Additionally, he is using half the alien energy he has collected to fire a weapon at Argo to kill Superman! Lex's war with Kryptonians will be a complete genocide! Lillian attempts to passively stop Lex by putting poison in his tea but he doesn't drink it. He already knew she tried to poison him. He gives them a glass of champagne to celebrate the death of Superman. Just as Lex begins to celebrate, Kara's news article goes viral! The truth of Lex's actions are revealed.
4. Shelly Island: Dreamer is able to reach the team and tell them where they are. A riot in the facility though stops her from saying more. James, Supergirl, Alex and Brainy head to the island to free the aliens and stop the power transfer to the new Claymore satellite that will wipe out Argo. Just then, Ben and his superpowered Children of Liberty arrive looking for a fight. Team Supergirl is able to defeat Ben and his Children of Liberty fairly fast but Lex arrives. As Lex flies off to get the satellite to fire on Argo, J'onn uses his powers to try and overload the power supply and save Argo.
5. Lex vs Supergirl: Lex truly thought that Supergirl was dead. He is very angry to see she is sill alive. Lex is of course prepared for it though. He uses Kryptonite but Supergirl is also ready and uses her new suit. The odds are even! J'onn and Dreamers' actions to overload the system are so odd to Brainy that it reboots him again and he returns to his normal self. He confesses his love for Dreamer and the two are able to overload the system. Lex then begins to get the upper hand on Kara. As he goes for the kill stroke, Red Daughter, just freed from the alien power device, rushes to take the shot for Supergirl. As Red Daughter dies, her power is absorbed in Kara. With her new power, she easily defeats Lex. She tries to save him but he'd rather die. He did have a back-up plan though and used a portable trans-mat system to get him back to his prison cell lab. Lena is waiting for him there and takes his superpowers away and shoots him in the chest! Before Lex can die, he reveals who Kara Danvers really is and phrases it in a way that makes Lena feel like she has no one on Earth that isn't lying to her. Lena is left alone, her brother dead at her hand, and she is destroyed.

In the final moments of the episode, the President is removed from office via the 25th amendment. James is back to being human but is injured from his fight. Colonel Haley then goes on TV to thank Supergirl and restore her reputation. Alex and Kelly are walking the streets of a newly freed National City and Kelly confesses she is interested in Alex. Alex then kisses her and the two join Brainy and Nia, J'onn and Kara at J'onn's office. Lena walks in, pauses briefly then decides not to let on that she knows. Alex and Kara have a moment and Alex advises her to let Lena have the night and not tell her. We then cut to George Lockwood who is holding a press conference and he is calling for peace. Ben sees his son take an opposite position of his in prison. Eve is trying to escape town but is visited by an older woman who reveals that she is working with an organization called Leviathan! Eve has been a pawn in the organization and she was ordered to work and seek out Lex for their purposes. The woman claims that Lex was supposed to move the needle and he did.

Finally, The Monitor arrives on Earth. He frees J'onn's evil brother Ma'alefa'ak and tells him he needs to walk this path alone. Ma'alefa'ak is dead set on finding and likely killing J'onn. Second to last, Lena is sitting in her office, she slams her drink down on a picture of Alex and Kara cracking the glass. She is in a very bad place. In the final seconds, The Monitor arrives at Lex's dead body. His purpose is unknown but he begins to cast a spell of some kind when we cut to black! Season four complete!

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