The premiere of the fourth season of Rookie Blue airs Thursday on ABC, and fans can expect some big changes this season, especially when it comes to Andy McNally.

Last season viewers saw McNally (Missy Peregrym) and Nick Collins (Peter Mooney) heading to their new assignment as undercover cops. Andy's relationship with Sam Swarek (Ben Bass) had just ended, which left her depressed and stressed. Moving on was the best remedy to cure Andy's broken heart, so she decided to take on a new assignment with Nick. Andy and Nick became much closer towards the ending of the last season, with fans speculating if the two will pursue a romance.

"It's not to be in a relationship [with Nick]. Nick has his own thing going on. There is a strong connection built there and we're just building on top of what we saw last season. They already have this very strong connection, but it's more friend-based," Peregrym said.

In the promo video below, Andy comes back to the precinct after her assignment and learns that Sam has found a new girlfriend.

According to co-creator/director Tassie Cameron, after season three ended with the death of one Jerry (Noah Jenkins), season four will bring its own challenges.

"We wanted to give ourselves some new challenges for the series and really start in a different place, six months later," Cameron told The Hollywood Reporter. "We wanted to keep surprising ourselves and the viewers and keep it fresh. That's why we started operating from the idea that you have to adapt and change to stay relevant."

Cameron also spilled the beans on Nick and Andy's relationship and said that the two have built a strong relationship.

"I think you can say [their relationship has grown deeper]. Nick and Andy have always been pals. We've set them up from the beginning. He was her breakup buddy in season three and she helped him when he was missing work because he was hung over."

Priscilla Faia, who plays the new rookie officer Chloe Price, will join the team and is expected to shake up the command.

"One of our characters calls her a game-changer. Chloe's an open book, refreshingly frank. She's a really fun character who speaks in run-on sentences and does whatever pops into her mind," Cameron said.

Tags: Rookie Blue