AU. Severide leaves for Spain with his girlfriend and things at 51 change. Casey's cousin Cyra Birch takes his place as squad lieutenant. Can they get over their problems and work together to keep 51 working?

Mike Stoker died tragically at 41 and leave behind his 22 year old daughter and 20 year old sons. Marco takes up the job as engineer and when Trinity gets a job at the station, the men have to deal with the daily reminder of their past friend. Can the guys ever accept Trinity as one of their own or will they keep comparing her to her father?

Dean and Sam stumble upon a small town with a huge family feud. When they discover the feud has properties right up their alley, they decide to intervene. They are joined by Taren Stone (OC).

The Doctor's past somehow always manages to catch up with him. One day, he gets a surprise phone call, from a Time Lady. He and Rose take a short trip across the pond and get the biggest surprise of their lives. They have to deal with this mysterious person and two very confused Avengers. This story includes Tiger, an OC.