Chicago Fire's Brett (Kara Killmer) and Casey (Jesse Spencer) are like peanut butter and chocolate: They just fit together so well.
Over the last few seasons, they've formed an even tighter bond while facing stressful life changes, like Casey's divorce and Brett's engagement to Chaplain Kyle (Teddy Sears).
Their close frienship will carry over into Season 9 as Brett deals with the fallout from her recent family issues. As you'll recall, she reconnected with her birth mother, Julie, who then died while giving birth to her half-sister.
In the Season 8 finale, Brett was dealt another emotional blow when Scott revealed that he and her sister were moving to another town and Foster (Annie Ilonzeh) came clean about applying to med school.