For the whole season we thought of ZOOM's Earth as Earth 2, and Jay at the end says to call his world Earth 3, then there is Supergirl that for now we could say is Earth Supergirl or Earth S.

However in the finale ZOOM states that Team Flash's Earth is the central Earth from which all other alternates have emerged.

Thus we should consider Team Flash's Earth to be called either Earth Zero or Earth Prime, this would make ZOOM's Earth to be Earth 1 as it is the first parallel world for them to have encountered, and thus making Jay's to be Earth 2 which makes things a bit more sensible since in the comics Jay and the JSA are all from Earth 2.

Supergirl's Earth would still be Earth S for now, pending any upcoming merges.

Yeah they messed up the numbers on the show, might be too late to fix it though. They called Zoom's Earth, Earth 2 for the last year.

PPP

Notice that in the current comics, you occasionally have heard "prime Earth", but we no longer hear of "Earth 1", except for that weird series of trade paperbacks that don't all take place on the same Earth.

If the Arrow/Flash universe is the prime Earth, I'd say THAT has to be thought of as Earth 1. Haven't they even used that term? "Earth 1"?

I'm fine with saying there's no other Earth that can be called "1". Just move on from this point. "1" suggests "the beginning", so there can't be any other but the one they've just identified, the Arrow/Flash universe.

I'm okay with Jessie and Harry's Earth being Earth 2, Jay's being Earth 3...

I'm just having a problem calling Kara's "Earth S" since that designation is usually kept for the Shazam characters' world. Maybe "Earth 5"? It looks like an "S", but it's also the number of sides on the traditional "S" symbol.

Yes TEam Flash did call ZOOM's world Earth 2, Wells however did point out that from his own viewpoint that Team Flash' Earth was Earth 2.

However none of them knew that Team Flash' Earth was the Earth from which all others have sprung. ZOOM informed them of that so that can change the numbering system if they wanted to.

Team Flash Earth could be Earth 1, Earth Zero, or Earth Prime. If they use Zero or Prime, then Well's Earth becomes Earth 1 and that puts Jay on Earth 2.

If they wanted to do that.

I'm still pretty sure we've already heard the Arrow/Flash universe called Earth-1...

I've always called "Earth-1" Earth Prime. And to me, Earth Prime IS Earth-1. So the numbering system still works.

As for Supergirl, I call her world, Earth-59 since 1959 was the year Supergirl made her debut in the comics.

Think that the major effect of the Flashpoint coming due to barry saving his mother will be to have the earth of Supergirl cease to exist, as it folded into the Flash earth, and for past 5 yeras, Supergirl would have been operating here all along, and both arrow and flash cast know her!

Think that Kara earth was be retconned into her always being on Flash earth, due to Barry causing a Flashpoint event!

It is a skewed system for naming as it is based on the order these earths have appeared in the series - Zoom's earth is Earth-2 purely because we saw it first, therefore Barry's earth is Earth-1. Supergirl's earth should be Earth-3 based on this order of appearance method, and Jay Garrick's Earth-4... in terms of importance I think going forward Jays earth will be of more importance than Zoom's now finished story of Earth-2, but given the weakness of the Zoom story it is a shame that the name is now associated with his story rather than Jay and the Justice Society. It is unneccessarily confusing.

Looking back on the series it does strike me that Earth-2 is the equivalent to Earth-3 in the comics universe, a world of villains, with one lone good hearted scientist standing against them.

I'd rather leave things the way they are. In the scheme of things Zoom's earth being Earth-2 and Jay's earth being Earth-3 isn't going to keep me up at night.

E 3 should be world of the JSA, but my guess is that Barry, by saving his mother, created a flashpoint event that will somehow merge them all together, or at least allow for both Jsa and Kara and her gang as being on his earth?

I am not at all sure. As I understand it the rights/licence situation might be too complicated for that, the Superman family has one foot in the Movies and a finger or two in other media, merging her show into the same universe as The Flash, Arrow, and the 'Legends' cast might be too difficult legally, and in terms of practicality having someone as powerful as Supergirl and other Kryptonians etc should alter the balance of the CW Universe considerably if they did do it...!

That would seem to work best IF they decided to bring the movie into the Tv series, like Marvel has...

I would think characters like the Martians and Kryptonian bric-abrac are a strong possibility yes, though with one eye on the budget these concept are likely to be handled in a lowerkey manner than you might have otherwise got on CBS, whch is not necessarily a bad thing, but I do hope the plotting can maintain ts high standard in Supergirl as opposed to the rather more woolly final episodes of the Flash this season... Supergirl may end up looking and feeling more like The Flash through sheer budgetary restrictions and a greater reliance on a support cast to carry the show and character, which while understandable may run the risk of becoming too similar in style and therefore too formuaic and predictable, for both shows....

Think most of us here would agree that season 1 Flash superior to season 2!