Nazi-archer collects some sort of unit that will let them reign forever.

Now lets check in on a better Earth, shall we?

And just who are these discourteous jerks?

Crisis on Earth-X, Part 1

Credit: Bettina Strauss/The CW

Oliver and Felicity, for one.

Hes fighting ninjas in Star City when Felicity confirms that they plan to attend.

Karas not off the hook, either.

The next thing we know, Karas joined Iris, Caitlin, and Felicity for mani/pedis and champagne.

(Karas cuticles, naturally, break the equipment.

Super-strong nails, Felicity quips.)

Meanwhile, Barrys trying on his penguin suit and worrying about his vows.

Still, Barrys pleased that Olivers finally learned that being a superhero doesnt exclude loving someone.

In fact, it gives you something to fight for.

Not all of our heroes are so lovey-dovey, though.

Stein is psyched; Jax is decidedly not.

Jax isnt impressed at the thought of becoming the Spectacular Sticky Man.

Wow, do I hope thats just conversation andnot ominous foreshadowing.

The rehearsal dinner, which is held at Jitters (awwww!)

Everybody hugs, clinks champagne glasses, and, in the case of Mick, hits the buffet hard.

He also asks Caitlin if he ever kidnapped her, and she recommends he not try it again.

I…think we all see where this is headed.

And yep, before long, theyre outside kissing.

Barry finds Kara looking down on the proceedings from the second story.

Thank you for showing me how to love again, he says, raising a glass to his children.

And he doesnt just mean a rehearsal dinner; he wants the wedding, too.

The, uh, love of his life who says no.

Oliver replies, Im actually physically incapable of talking about anything else right now.

Flustered Oliver Queen isthe bestOliver Queen.

The conversation ends with her yelling, Oliver, I dont want to marry you!

Girl, I am always on your side, but OUCH.

Thankfully, theyve got a few more crossover episodes to sort this all out.

Its now the morning of the wedding!

Our heroes wake up in various moods.

Her attempt at a sneaky exit is neither quiet nor graceful.

Karas amused at her sisters one-night stand, reminding Alex that shes a single lady now.

Alex is open to this idea, although shes taken aback to learn that Saras an assassin.

Barrys eyes shine with tears and this isbeforeJoe whispers that he wishes Barrys parents were there.

They are, Barry replies.

Show continuity, FTW!

So long,William Katt, a.k.a.

Ralph HinkleyfromThe Greatest American Hero.

That was a heck of a cameo.

The fatal blast was courtesy of Nazi-girl, who growls, Peace is overrated.

Yep, the church has been overrun with Nazi troops, who open fire on the crowd.

In short, you picked the wrong church, Nazi chumps!

Then he has Cisco breach him up to the balcony to engage the Nazi-archer upstairs.

Nazi-Prometheus arrives on the scene, complete with that ominous cascading theme song that I so loved last season.

Sara and Alex team up to take him down, exchanging high fives when they do.

Meanwhile, Supergirls taken to the sky to fight the masked woman.

Theyre evenly matched (what a shock!

), and Supergirl gets knocked through the exterior of the church to crumple on the floor.

(Gee, I wonder why Nazi-archers so eager to protect Nazi-girl?)

Best wedding ever, Mick crows.

Oh, bless your sweet faces, all of you.

Even as an alt-Earth Nazi, cant they recognize Karas fabulous hair from a mile away?

Then the pair remove their masks to reveal the faces of Oliver Queen and Kara Danvers.

Snaps of the cape: