I agree with Heat Wave: "Best Wedding Ever."
Part one of the four-part epic crossover event, kicking off last night with Supergirl, delivered such an entertaining episode and set a great tone for the next episode.
In the parallel world, Earth-X, where the Nazi regime has ruled the planet, a dark hooded archer called Dark Arrow kills the American loyalists and others that are part of the resistance. Dark Arrow takes on The Guardian and, after a couple of seconds of battling, kills him. He joins his team as they are about to take a machine that will make sure they spread their hatred. Dark Arrow orders his team but changes when his partner Overgirl gives her orders.
Meanwhile, there's a wedding coming with Iris and Barry. They wonder if the others (Supergirl, Arrow, and the Legends) have RSVP their invitations, for which we get to see some kick-ass fighting scenes with our favorite DC TV heroes, but Kara and Alex get a moment during their bond time and decide to go.
With the girls having their time, Barry and Oliver have their Groom/Best Man talk about settling down, which is excellent and funny, with Barry making a joke that Oliver doesn't laugh at all. During the dinner, with everyone there, Iris' father gives a heartfelt speech about how they helped him find his way back to love again. The dinner had other great moments, one being Alex and Sara drinking up and having a one-night stand. The other Oliver is talking to Felicity about settling down, but she doesn't want to and walks away.
As the wedding begins, Kara sings, and just as the wedding starts, the minister is killed by Overgirl. After a fascinating and entertaining fight scene, Kara injures Overgirl during the fight, and the Nazis retreat, but our heroes capture Dark Arrow's partner Prometheus.
Dark Arrow and Overgirl discuss the plan and meet with the yellow speedster, who discuss their next step. Dark Arrow and Overgirl unmasked themselves and are revealed to be the parallel universe doppelgangers of Oliver Queen and Kara. The yellow speedster is Barry's presumed deceased nemesis, Eobard Thawne, the Reverse-Flash.
"Crisis on Earth-X Part 1" was nothing but stunning. The first part of the crossover event delivered such a kick-ass start with such thrilling to humoring moments, mostly coming from Heat Wave and even the moments with Sara and Alex, for which I'm down with that relationship if anyone has any objections. The drama between Oliver and Felicity was excellent, and I assume it'll carry good for the next episode. I think this might be one of the best crossover events than the one last season. The writing was excellent, and the performances go to an equal amount of everyone's effort. Overall, I give this episode 9/10.
You can catch the epic crossover event with Arrow last night and tonight's episode of The Flash and Legends of Tomorrow beginning at 8/7c on The CW. You can see the fall finale of Supergirl following Monday at 8/7c on The CW.