“Pretty Little Liars” (Adam Rose/ABC FAMILY)

FINALE WATCH: On the fourth-season summer finale of “Pretty Little Liars” (ABC Family at 8 p.m.), ABC Family promises that the girls will make a discovery that proves everything they know about the evil “A” could be wrong — which is great, given that the show’s crazy plotlines make so much sense already. Plus, a look at the new, mysterious town of Ravenswood, the location of the spinoff that will debut in October.

The last film of ESPN’s “Nine for IX” series is “Branded” (ESPN at 8), which looks at the double standards and pressure applied to female athletes to capi­tal­ize on their sex appeal when they’re not on the field.

Kids around the country talk about the assumptions and misconceptions of being a twin on “Nick News With Linda Ellerbee: Twinsanity!” (Nickelodeon at 8). Says 14-year-old Taylor, who has a twin brother, Torrance: “Sometimes people ask if we’re identical . . . and I just feel as if they need to be slapped.”

RETURNING SHOW: The spinoff “Storage Wars: Texas” (A&E at 9, 9:30) is back for a third season as buyers Ricky and Bubba are determined to make more dough dominating storage-locker auctions around the Lone Star State. In the opener, they go to Texarkana, Tex., on a mission to find old furniture.

FINALE WATCH: Thanks to her connections with the popular crowd, Lacey learns a secret that could help Danny on the Season 1, Part 1 finale of “Twisted” (ABC Family at 9), so she considers sacrificing the inroads she’s made with the in crowd by spilling the information.

“The March” (WETA, MPT at 9), a documentary narrated by Denzel Washington, pays tribute to the 50th anniversary of the March on Washington by looking back at the event in 1963 and the Rev. Martin Luther King Jr.’s “I Have a Dream” speech.

Dinner parties shouldn’t be all fun — there needs to be a competition in there. A new special, “Keep the Party Moving” (Style at 10), pits neighbors against each other — with the help of some event planners — to see who can serve the best course at a progressive dinner party.

Ava’s case is causing all kinds of problems on “Suits” (USA at 10), as Harvey and Stephen clash over how to handle it and Jessica deals with awkwardness between her and Harvey as she strategizes the best defense.

Journalist Anderson Cooper is on “The Late Show With David Letterman” (CBS at 11:35), along with actress Olivia Munn and musical guests Robert Randolph & The Family Band.

“The Tonight Show With Jay Leno” (NBC at 11:35) hosts actor Josh Duhamel, comedian J.B. Smoove and a performance by Macklemore & Ryan Lewis.

— Emily Yahr