WHAT TO WATCH

■ Portland always will be weird, it’ll just be a little less so after the final episode of the Fred Armisen-Carrie Brownstein sketch series “Portlandia” (10 p.m. Thursday, IFC).

■ Mulder (David Duchovny) and Scully (Gillian Anderson) investigate what may be their last case in the season finale of “The X-Files” (8 p.m. Wednesday, Fox).

■ The lines between the personal and professional lives of the firefighters of Seattle’s Station 19 become blurred in the aptly named “Grey’s Anatomy” spinoff “Station 19” (9 p.m. Thursday, ABC).

■ When a serial killer begins using his book as a how-to manual, a professor (Alan Cumming) helps the NYPD track the murderer in “Instinct” (8 p.m. Sunday, CBS), based on the James Patterson novel.

Shane Harvey Fox Gillian Anderson and David Duchovny in “The X-Files,” airing Wednesday.

Mitch Haaseth ABC Grey Damon in “Station 19.”

IFC Fred Armisen and Carrie Brownstein star in “Portlandia,” airing Thursday.

Jeff Neumann CBS Alan Cumming stars in “Instinct.”