In the latest interview in this series John Noble talks about his relationship with Nina in the new timeline.
It is an interesting dynamic in this new timeline. Noble discusses Walter's misplaced feelings of blame on Nina due to the drowning death of RedVerse Peter and the guilt associated with that. He also talks about the joys of working with Blair Brown and speculates as to Nina's motivations in asking Walter to embrace the adult Peter that has shown up in the Season 4 Time Line.
Noble has always found Nina a mysterious character and ponders if she is up to no good.