SEASON PREMIERE

ANDY MCNALLY AND NICK COLLINS RETURN TO 15 DIVISION FROM UNDERCOVER DUTY TO FIND LIFE HAS MOVED ON WITHOUT THEM, LEAVING THEIR PERSONAL AND PROFESSIONAL LIVES IN DISARRAY, ON THE SEASON PREMIERE OF ABC'S "ROOKIE BLUE"

Missy Peregrym Returns as Rookie Police Officer Andy McNally, With Gregory Smith Starring as Fellow Rookie Dov Epstein

Priscilla Faia and Rachael Ancheril Join the Cast as New Rookie Chloe Price And Training Officer Marlo Cruz, Respectively

A group of young and ambitious rookie cops continue to navigate the emotional trials and tribulations of their professional and personal lives. After three years on the job, these rookies are well on their way to becoming experienced officers, but at what cost? It's been six months since Andy McNally and Nick Collins left for their undercover operation. But while they were gone, everything seems to have changed at 15 Division, on the Season Four premiere of "Rookie Blue," THURSDAY, MAY 23 (10:01-11:00 p.m., ET), on the ABC Television Network.

In the season premiere, "Surprises," Andy and Nick continue to work undercover infiltrating a meth pipeline. However their covert mission goes sideways when Nick � then Andy � go missing. Meanwhile, a random arrest at 15 Division puts Sam Swarek and the other officers in the middle of the drug investigation-turned-rescue operation. Finally, Andy must figure out how to cope with the transformation of her own life as well as those of her friends at the station and continue to do the job she loves.

That's what being a cop is: adjusting to new situations, rolling with the punches. Change is constant, and if you don't adapt, you're left behind. So when Andy returns to find that Sam Swarek is now a Detective and that he's moved on, she's going to have to figure out how to deal with it. Meanwhile, Dov's life gets awkward when a one-night stand with Frank's goddaughter becomes more complicated. Chris is torn between staying at 15 Division and moving his new family back to his smaller, safer hometown. Traci is learning to work with new detective Swarek while trying to move on from the loss of her fiancé, Jerry Barber. And although Nick and Gail have cemented their relationship, Nick can't seem to shed the feeling that all is not right between them. Last season, our officers got what they wanted and had to deal with the repercussions. This year, they will have to look change right in the eye and learn to adapt -- leaving them with some big, bold choices to make.

"Rookie Blue" stars Missy Peregrym ("Heroes,""Reaper") as Andy McNally, Gregory Smith ("Everwood") as Dov Epstein, Charlotte Sullivan ("The Kennedys") as Gail Peck, Enuka Okuma ("24") as Traci Nash, Travis Milne ("Leslie, My Name is Evil") as Chris Diaz, Peter Mooney ("Camelot," ABC's Family/Global's "Falcon Beach") as Nick Collins, Ben Bass ("The Eleventh Hour") as Sam Swarek, and introducing this season Priscilla Faia ("Eleventh Victim," "Psych") as Chloe Price and Rachael Ancheril ("The Listener") as Marlo Cruz. Also starring in the series is Matt Gordon as Oliver Shaw and Lyric Bent as Frank Best.

Guest starring in "Surprises" are Louis Ferreira as Jacob Blackstone, Tyler Hynes as Von and Matthew Bennett as Simon Dent.

"Surprises" was written by Tassie Cameron and directed by David Wellington.

Tassie Cameron ("Flashpoint"), Ilana Frank ("The Eleventh Hour," "Would Be Kings"), David Wellington ("The Eleventh Hour," "Would Be Kings"), Russ Cochrane and John Morayniss ("Klondike," "Rogue") are executive producers. "Rookie Blue" is produced by ICF Films and Entertainment One.

"Rookie Blue" is broadcast in 720 Progressive (720P), ABC's selected HDTV format, with 5.1-channel surround sound. A TV parental guideline will be assigned closer to airdate.

This episode of "Rookie Blue" will be available on ABC.com the day after airing on the network for users to watch online.

For more information on "Rookie Blue" please visit ABC.com.