'MOTIVE': The latest case involving the murder of a prosecutor becomes personal for Cross (L, Warren Christie), and Angie (R, Kristin Lehman) knows they must come clean about their past. (Jeff Weddell/ABC)

The final four dancers — Zack Everhart Jr., Jessica Richens, Valerie Rockey and Ricky Ubeda — perform with all-stars from previous seasons, including Aaron Turner and Kathryn McCormick on a live, two-hour “So You Think You Can Dance” (Fox at 8 p.m.). In addition, “Modern Family’s” Jesse Tyler Ferguson joins the judging table and Jason Mraz performs.

Survivors of the massive 2008 earthquake in China that leveled the town of Beichuan and killed 90,000 people share their experiences on “POV” (WHUT at 8), and current Beichuan residents give insight into how difficult a transition to a new life can be after such a catastrophic event.

Two hours of “Extant” (CBS at 9) has Molly in a panic after Sparks takes her “offspring” and an unlikely union between Molly and Yasumoto when he swings in to help, but then John makes a worrisome discovery about him.

SERIES PREMIERE: The reality/makeover show “Girlfriend Intervention” (Lifetime at 10) introduces us to four stylish African American women who are looking to help their white girlfriends get their mojo back by using humor, chemistry and spirit to restore confidence.

SERIES PREMIERE: “Operation Maneater” (MPT at 10) follows tech savvy veterinarian Mark Evans around the world as he invents new ways for humans and normally deadly animals to live in harmony. In the premiere, Evans travels to Western Australia to attach tracking mechanisms to white sharks so he can monitor their aggressive behavior.

There’s a blackout in Brooklyn and a Jungle K gang member shoots up the precinct, leaving two cops dead, on “Taxi Brooklyn” (NBC at 10).

FINALE WATCH: “Motive” (ABC at 10), a ratings smash in Canada but not so much in the States, wraps up Season 2 with Cross and Flynn’s past re-emerging, which makes Flynn realize it’s time to be honest about their history.

Michael Sheen of “Masters of Sex” fame swings by “The Colbert Report” (Comedy Central at 11:30).

Comedian Chris Rock and Gov. Chris Christie (R-N.J.) come to “The Tonight Show Starring Jimmy Fallon” (NBC at 11:35), with Kacey Musgraves playing musical guest.

Actor James McAvoy is on the “Late Show With David Letterman” (CBS at 11:35), with music from the Last Internationale.

“Jimmy Kimmel Live” (ABC at 11:35) welcomes actress Jennifer Aniston.

Rachel Lubitz