POSSIBLE SPOILERS
I’ve seen some theories floating around here and there about Jack being possessed by a Pah Wraith. The more that I think about it, the more I think it could be true.
We saw Jack’s eyes turn red like Jake Sisko’s did in the DS9 Episode, “The Reckoning” And the patterns on Jake’s face when he was possessed looked similar to the vines (?) we see during Jack’s visions. Also, the red lightning that we see during the visions. Now, before episode 4, I would’ve gone along with the Changeling theory, but it seems more like Jack’s being possessed more than anything.
I’m stuck between the two theories as of right now. There is good evidence for both sides. I’m curious as to what y’all think.