NEW GIRL: Schmidt, Cece, Coach and Winston try out their survival skills when the gang goes on a camping trip for Thanksgiving. (Adam Taylor/FOX)

The years from 1968 to the present are chronicled in the last installment of “The African Americans: Many Rivers to Cross” (PBS at 8 p.m.). The special highlights the post-civil-rights era, the growing black middle class, Barack Obama’s historic 2008 presidential campaign and his 2012 reelection bid.

Four members of a church chastity group are murdered, and Sheriff Mills asks Sam and Dean to help the investigation on “Supernatural” (CW at 9). Dean disappears at the beginning of the investigation, and Sam and the sheriff have to team up to rescue him.

The “New Girl” (Fox at 9) crew is celebrating Thanksgiving with a camping trip; Coach and Schmidt compete to be the best woodsman, while Cece and Winston bond over a dislike of the outdoors.

FINALE WATCH: The winner of the 17th season of “Dancing With the Stars” (ABC at 9) is announced in the last segment of this two-part finale.

RETURNING SHOW: The Season 2 premiere of the unscripted series “Boston’s Finest” (TNT at 9) opens with memories of the Boston Marathon bombing and the department on high alert at Boston’s Fourth of July celebration.

One of Mindy’s exes invites her to his wedding on “The Mindy Project” (Fox at 9:30), and in her rush to find a date, she decides to take Peter. He turns out to be an ideal date until he makes a horrifying blunder.

SERIES PREMIERE: Set in Houston and produced with the cooperation of the U.S. Marshals Service, “Marshal Law: Texas” (TNT at 10) centers on the elite Gulf Coast Violent Offenders and Fugitive Task Force and follows its officers as they track down offenders, serve warrants and hunt for some of America’s most-wanted criminals.

Inhabitants of the swamp and the cast of the History Channel’s “Swamp People” celebrate Thanksgiving in their own fashion on the special “Swampsgiving 2” (History at 10). Prepare to be dazzled by perhaps the most rustic dinner since the one the Pilgrims hosted.

Business magnate and entrepreneur Martha Stewart is on “The Late Show With David Letterman” (CBS at 11:35), with musical guest Pitbull.

Filmmaker Quentin Tarantino and television personality Jim Stacy join “The Tonight Show With Jay Leno” (NBC at 11:35), along with musical guest Luke Bryan.

Actor Casey Affleck and ex-boxer Mike Tyson come to “Jimmy Kimmel Live” (ABC at 11:35), with a musical performance from Linkin Park with Steve Aoki.

— Rachel Lubitz