OK, I must have missed a lot.

I was traveling to the worlds fighting heartless and nobodies, when I saw the cut scene of Kairi being captured. I immediatly went to Twilight town, and from there to the hollow bastion because it was(SPOILER) "covered in darkness". I went to Tron's world took care of everything there (that motorbike game was hell in a handbasket), and now I'm stuck. I am at the part where you fight (SPOILER)Demyx again.

I have completed nearly all of the worlds once, I bleieve that I need to do the Pride lands, and Halloween town, and apparently, The World that never was.

Could someone help me out here?