Being Human Season 1 Episode 13
A Funny Thing Happened on the Way to Me Killing You
Bishop's attack left Aidan near death. Celine offered her life to Aidan to restore his.
Sally's door was gone before she went through, and missing it left her more closely tethered to the earth and therefore more corporeal.
Nora was let in on the fact there are secrets to Josh's life, but he wouldn't tell her what they were. Until she followed him and saw him change. When he changed, so did the baby, and Nora appeared to lose it. They decided their future is more solid than ever, and when he left, she revealed the scratches he gave her when he pushed her out of the room.
We learned how Josh and Aidan met and just how close they have become over the years.
Bishop paid the ultimate sacrifice for threatening Aidan's family, and Aidan inherited his place in the vampire hierarchy.