From Amber Dowling of TV Guide:

• The Shat is back
  Canadian-born Shatner will appear on the Season 3 opener of Rookie Blue, the Global/ABC cop drama about rookies, set to return next summer. He will be joined by new recruit Peter Mooney (Camelot), who plays ex-soldier Nick Collins, 15 Division’s newest rookie. Season 3 will also feature the addition of the currently un-cast character of Andy’s mother, while one of the rookies will get a promotion. Read more.

*Special Time* – 8pm ET/PT

“On the Double”

Landon Norris (Covert Affairs) and Aaron Abrams (Producing Parker) Guest Star

The rookies hunt down a vigilante impersonating an officer after Gail’s uniform is stolen. A drug deal gone awry offers clues as Chris and Dov unravel the motive behind the cop masquerade. Meanwhile, Andy and Sam’s forbidden romance threatens his entire undercover operation.

*Season Finale* – 10pm ET/PT

“God’s Good Grace”

Callum Keith Rennie (The Firm, Californication) and Shannon Kook-Chun (Degrassi: The Next Generation) Guest StarAndy blames herself for Swarek’s mysterious disappearance and struggles to find a lead in the case. Meanwhile, shocking events triggered by the investigation incriminates one of their own and could put an end to Andy’s career.

From Vlada Gelman of TV Line:

• Rookie Blue Collars William Shatner
  The former T.J. Hooker star will play “a very drunk driver” in the Season 3 premiere, reveals executive producer Tassie Cameron. The role “starts comic and ends dramatic, so we’re hoping it gives him a chance to do what he does so well,” she adds. “He’s got such great range.” Read more.

Canadian actor Callum Keith Rennie (The Firm, Californication) Guest Stars

Andy, Dov and Traci are tested with a challenging undercover training exercise, but things go awry when Andy and Traci encounter Swarek on his own undercover operation. Meanwhile, Dov faces a choice that could threaten his career