On the night shift, the hospital takes over the out-of-hours emergency service for 25 vet practices in the north east of England, and tonight veterinary intern Marina is called to deal with an unusual case – a cat struggling to give birth. Surgery is the last resort, so they try an alternative method. On the dog ward, a popular patient is back. Guide dog Sherpa comes to see surgeon Anna for a check-up on his wounds. Having previously stayed at the pet hospital for a month, Sherpa has a close bond with the team, who are excited to see him again.