Yeah, a little earlier than expected.
The episode (2×17) is called “Gary Unmarried?” and it airs on Wednesday, March 17 at 8:30/7:30c on CBS. Garret plays Gary’s divorce lawyer.
Here is the synopsis:
GARY FINDS OUT THAT HE AND ALLISON ARE STILL LEGALLY MARRIED, ON THE SEASON FINALE OF “GARY UNMARRIED,” WEDNESDAY, MARCH 17
“Gary Unmarried?” – When Gary finds out that he and Allison’s divorce papers were never filed, he uses the information to manipulate her into giving him his stuff back. Meanwhile, Allison’s sister Rachael comes to town and gives Mitch a makeover, on the season finale of GARY UNMARRIED, Wednesday, March 17 (8:30-9:00 PM, ET/PT) on the CBS Television Network.