“Astronaut Wives Club” (8 p.m., ABC): Season 1 heads back into the hangar.

“Astronaut Wives Club” (8 p.m., ABC): Season 1 heads back into the hangar.

“Documentary Now” (10 p.m., IFC): Former “Saturday Night Live” castmates Fred Armisen and Bill Hader immerse themselves in the mockumentary genre with this offbeat six-part series that lovingly parodies notable documentaries and “honors some of the most important stories that didn’t actually happen.” Lending humorous gravitas to the endeavor is Helen Mirren, who serves as series host.

“Under the Dome” (10 p.m., CBS): We’re as surprised as anyone that those poor people in Chester’s Mill are still stuck “Under the Dome.” Tonight, an unexpectedSFlballiance forms in hopes of attacking said dome.

“Alone” (10 p.m., History): In the Season 1 finale of “Alone,” only two men are left on the island as a vicious storm approaches, leaving them to contend with isolation and starvation. Meanwhile, we will be watching from our comfy couch.

TV listings, B6