Everything's changed.

So says Deb in the following video, and that's really all you need to know heading into Dexter Season 7, isn't it?

Of course, if you want to know a lot more, consider yourself spoiler warned and click Play to go behind the scenes, listening to Michael C. Hall and company preview the "fundamental changes" to come on the Showtime smash.

Foremost among them: what Deb now knows and how she'll react to that knowledge, combing through evidence and hearkening back to her past experiences by asking her brother at one point:

"I was set up on that table the same way Travis Marshall was set up on the altar. How do you explain that?"

Dexter Season 7 kicks off on Sunday, September 30.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.