"Reign" brings the teenage Queen of Scots and her family to the CW. (Joss Barratt/The CW)

Elena and Katherine both dream that Stefan is in danger on this week’s “The Vampire Diaries” (CW at 8 p.m.). They convince Damon to help them find him but their plans are thwarted by a mysterious woman named Tessa who seems to know everything about Stefan’s past and Damon’s disconcerting future.

Leslie tries to be the voice of reason yet again when a minor Pawnee scandal gets blown out of proportion on “Parks and Recreation” (NBC at 8). Meanwhile, Ben encourages Ron to prepare his last will and testament and Tom tries to woo a woman the best he can.

SERIES PREMIERE: New drama “Reign” (CW at 9) stars newcomer Adelaide Kane as Mary, Queen of Scots, back when she was a teenager. In the opener, Mary arrives in France, where she is supposed to marry the French king’s son to secure the country’s strategic alliance with Scotland. Post TV critic Hank Stuever says: “Once you get past the utter silliness of the idea, ‘Reign’ is kind of a kick.”

Meet people intent on surviving at all costs, even when those costs include drinking your own toilet water, on “Apocalypse Preppers” (Discovery at 9). The special takes a look at some of the mind-boggling ways people are preparing for the end of the world in case it ends with a black plague, an alien invasion or a robot rebellion.

RETURNING SHOW: Neal makes a dangerous deal to help Peter after he is accused of playing a role in Sen. Pratt’s death on the season opener of “White Collar” (USA at 9).

Meredith struggles to balance work life with motherhood on “Grey’s Anatomy” (ABC at 9). Callie and Owen get wrapped up in an emotional dilemma and Stephanie strives to impress Jackson’s mother.

RETURNING SHOW: Annie goes solo on “Covert Affairs” (USA at 10). After her “death” last season, Auggie, Joan and Arthur try cope with the onslaught of questioning back at the CIA.

Actress and singer Selena Gomez comes to the “Late Show With David Letterman” (CBS at 11:35) for an interview and performance.

Comedian Dana Carvey and musician-turned-TV judge CeeLo Green join the “The Tonight Show With Jay Leno” (NBC at 11:35), along with musical guests Goodie Mob.

Actress Kerry Washington and “Science Bob” Pflugfelder come to “Jimmy Kimmel Live” (ABC at 11:35), with a performance by Sleigh Bells.

— Rachel Lubitz