Nathan just hasn't been himself lately.
- Angela

The Petrelli matriarch, of course, knows exactly what is wrong with her son on next week's Heroes, as Nathan continues to exhibit signs of the villain inside of him.

Also taking place on "Acceptance," Monday's installment: Tracy tries to get her old job back; while Swoosie Kurtz - who we've interviewed and may be the nicest person on the planet - returns as Angela's old friend.

Watch the official promo for this episode below:

[video url="http://www.tvfanatic.com/videos/preview-of-acceptance/" title="Preview of Acceptance"] [/video]

We've also compiled a handful of pictures from the upcoming hour. Talk about it now in our Heroes forum and click on each image for a larger version:

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