I’m curious as to the way Julia was credited after the first three seasons. When Julia returned in Season 4, Abby Dalton was immediately re-added to the opening titles, despite the fact she did not appear in every episode, and left again in “Forsaking All Others”. She generally only appeared in one or two scenes per episode, if at all, until “Retribution”. Her credit led us to believe the character had returned permanently, but that was not to be. Abby Dalton did not get an opening credits shot in Season 5 or Season 6 - understandably in Season 5 as her intermittent appearances suggested she was a guest star. As far as we were aware Julia was back to stay at the start of Season 6, although being credited as a guest star suggested otherwise. I wonder why it was decided to include Abby Dalton on the Season 4 titles but not Season 6 - something to do with the contract she signed? Had storylines not been rewritten, I expect she would have stayed until the end of the season, with the tunnel collapse from “Retribution” being the season finale, and perhaps more characters in peril, including Julia?