'Homeland' has told a variety of stories about Carrie Mathison and her struggle with dealing with her bipolar disorder over its first three seasons. When audiences meet up with Carrie again in the Season 4 premiere, they'll find that she's surprisingly stable, all things considered.
Part 2 of the interview deals with where Carrie is at with her disorder this year.
The end touches on my single biggest pet peeve when people talk about this show which is that Carrie is bad at her job and “failing upwards.” This makes me want to plunge into a grave filled with rusty nails. I’m actually quite annoyed the writers even tolerate this conversation at all because it’s utter bullshit. /rant