Lame so far.

I'm watching it and so far it's pretty disappointing. There's about 10 minutes left (not including commercials) and no mention of the crossover.
Instead we're being treated to another politically correct liberal pandering episode spending too much time focusing on Alex being a lesbianagain.

Extreme Hype. There was no reason to include this show in the crossover event when only 3 minutes of it will matter and those 3 minutes will be seen in The Flash as well I'd bet. Supergirl has to many other stories going on. The Flash episode should have started the crossover with the 2 other shows. The Flash finds out about aliens, finally tells everyone how he met one, him and Cisco go get her and know one really has to know at what point they pull her from. Her agreeing to leave her earth with everything that's going on makes no sense.

wouldn't be surprised if most of the stuff in the trailer is from the flash.
You can't persuade fanboys. You'd be better off trying to convince a wall. ~CodeNamePlasmaSnake~

I'm watching this instead of Gotham because of the crossover. I'm disappointed that it won't happen until the end.

They couldn't mention it last season cause the crossover only worked one way.

Yeah, same here.
"I'm the ultimate badass,you do NOT wanna f-ck wit me!"Hudson,Aliens

That always annoyed me that Barry's trip to Supergirl's Earth was never mentioned.
If it's all the same to you, I'll have that drink now.-Loki (Marvel's Avengers)

That wouldnt make sense with how it plays out in the trailer. They have to show why Barry went there before

Yeah I'm sure the Supergirl episode is actually taking place at the same time as the beginning of The Flash episode.

I doubt we will see the invasion in Supergirl, since there will be too much story beforehand (invasion; meeting up with Arrow/ Argus to discuss the invasion and the plan to get Supergirl).
It is almost as though you could skip the Supergirl scene since it probably just a portal scene and the introduction of Cisco to Supergirl. The opening scene of The Flash, Cisco and Barry will explain what happen and why they are there.

I agree. And he have to encounter the aliens first like we saw in the Promos. Or it would feel out of place showing it after he gets Supergirl

It will be a little disappointing if they don't somehow do a transition and show the invasion/whatever start and Flash react to it, explain his idea for help , etc.
Because if it is just going to have Barry and/or Cisco show up toward the end , it means that Barry's already told Cisco/everyone about Supergirl and his dimensional trip the last year , that never came up on Flash, and that to me is going to be a cop out to still not having explain it.
Hopefully they have a line or something to deal with Barry not saying anything
Cisco : "Man , I still can't believe Barry didn't tell us about you , Kira"
Barry and Kara : "Kara!"

Yeah guess he does. Cool