8x16 7:00AM - 8:00AM
It won't be clear until the next episode, but this seems to make the end of Story Arc #2. That said, Arc #1 was actually part of Arc #2, we just didn't see that until a little later -- so really, the whole season has been Arc #1 until now. That pleases me. Plenty of other things about this season don't, but that does.
3x20 Slice of Death