TV picks: HBO's 'Marathon,' NBC's 'National Dog Show,'Netflix's 'Gilmore Girls' and more

* SATURDAY NIGHT LIVE.

11:29 p.m., NBC10.

Longtime cast member Kristen Wiig returns to host for the second time. Musical guest: The xx.

* THE AFFAIR. 10 p.m. Sunday, Showtime.

The third season premiere moves the story ahead three years, with Noah (Dominic West), newly released from prison, somewhat disturbed, and as annoying as ever. The performances? Still terrific.

* MARATHON: THE PATRIOTS DAY BOMBING. 8 p.m. Monday, HBO.

Moving documentary, produced in conjunction with the Boston Globe, follows some of those affected by the April 2013 terrorist attack as they struggle to recover.

* SEARCH PARTY. 11 p.m.

Monday, TBS.

Alia Shawkat (Arrested Development) stars as twentysomething Dory in a dark comedy in which she gathers friends to investigate the disappearance of a college acquaintance.

* NATIONAL DOG SHOW. Noon Thursday, NBC10.

John O'Hurley (Seinfeld) hosts, with David Frei providing analysis and skaters Tara Lipinski and Johnny Weir reporting on the

Kennel Club of Philadelphia's

annual event.

* GILMORE GIRLS: A YEAR

IN THE LIFE. Friday, Netflix.

Four episodes reunite the show's stars, including Lauren Graham, Alexis Bledel, Kelly Bishop, Haddonfield's Scott Patterson, and, yes, Melissa McCarthy. It's billed as the show's final season - the one creator Amy Sherman-Palladino never got to do on the CW.