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.