Warning: This story contains major spoilers from Sundays episode ofOnce Upon a Time.
Read at your own risk!
The Final Battle has begun!

Credit: Jack Rowand/ABC
Where have they actually gone?
The final battle that we have been waiting for.
Its going to be a showdown of epic proportions.
That is for sure.
Can you say where?DALLAS:Where?
You mean where it happens?GOODWIN:Storybrooke.
Thats where it is, geographically.
Emotionally, they are all over the map.
Main Street more specifically.
Weve seen so many curses on this show.
How does the Black Fairy finale curse compare?
If it were to break!
I am not saying it breaks!
We could all just be blown into oblivion, and thats just it.
Emma just used the power of song to stop your evil villain.
How can you top that in the finale?GOODWIN:It is top-able.
You cant hey everybody.
I think each character gets something that the fans should be happy with, that each character deserves.
Are people working together or are they split?DALLAS:I think everybodys working together.GOODWIN:Its together-y.
Thats the scientific word.DALLAS:Its the only way.
Its the only way to defeat it.
So I think that togetherness [is there] through the finale.
How much extra time did this musical episode require?DALLAS:We didnt get any extra time.
It was that we were doing crazyZootopiaOscars stuff at the same time.
]GOODWIN:As you should.
No one had ever heard us.
I think its huge for us.
Did you end this episode going, Why havent we been doing this the whole time?
Were different in terms of how we approach the material.
Its definitely better that it was a one-off.
I dont know how long we could have kept that going realistically.
The most dramatic moment in this episode was Charmings entrance.DALLAS:Thank you!GOODWIN:Agreed!
How many takes did you do?
Oh yes, I walked off the balcony last night and made this wish.
I did a hundred takes of Oh, my!
Who knew?DALLAS:I didnt even know!
He was so self-involved with his own voice.
Do you still keep it with you?
Our eldest, weve played the song for.DALLAS:He loves it.GOODWIN:He loves it.
He hasnt seen it.
Weve never let him see us on TV on purpose.
Sometimes weve been flipping through something where, Thats Mommy and Daddy!
And he has dolls of us, which I know is probably unusual.
So Im like, Come here and take a look at this.
And hes like, Mommy and Daddy.
If this is the last episode, how do you feel about where your characters end up?
I mean, in classicOnce Upon A Timestyle, there is a twist.
The twist means that it could go either way, and it serves all of the characters very well.
How about for Emma though?
I dont think that the scenarios could have been flipped.
Its a really good story line.
Are you guys aware of any plans for Season 7?
Once Upon a Times two-hour finale airs Sunday at 8 p.m.