‘HOSTAGES’: Duncan and Kramer discuss how to use Sandrine to their advantage after she betrays them during the two-hour season finale on CBS. (JEFF NEUMANN/CBS)

Host Bret Baier will celebrate his anniversary on this special episode of “Special Report with Bret Baier” (Fox New Channel at 6 p.m.). Baier has been at the helm of the highest-rated cable evening newscast in the 6 o’clock time slot for five years.

RETURNING SHOW: Former “Bachelorette” contestant and single dad Juan Pablo Galavis gets a second chance at love on season eighteen of “The Bachelor” (ABC at 8). There are 27 female contestants this year, including a nurse, a hippie and a pregnant woman, and after the first rose ceremony, nine women are sent home.

On “Private Screenings” (TCM at 8), the tables are turned, and regular series host Robert Osborne is interviewed by actor Alec Baldwin.

A serial killer is broadcasting the final moments of his victims’ lives on the Internet on the latest “Almost Human” (Fox at 8), and Kennex is in danger of being added to the list of fatalities.

RETURNING SHOW: Season three of “Rachael vs. Guy: Celebrity Cook-Off” (Food at 9) opens with the eight celebrity contestants arriving in New York for the culinary competition and hosts Rachael Ray and Guy Fieri strategically picking their teams. The first challenge has the contestants providing food and entertainment for a medieval feast.

FINALE WATCH: “Hostages” (CBS at 9) concludes with a two-hour finale that has the first lady confronting Ellen about the assassination plot just as Ellen is about to operate on the president.

RETURNING SHOW: “Teen Wolf” (MTV at 10) is back to resume season three. Scott, Stiles and Allison are still reeling from the effects of dying and coming back to life, effects they were warned about by Deaton.

Actress Lena Dunham stops by the “Late Show With David Letterman” (CBS at 11:35), along with musical guest Brandy Clark.

Comedian Louis CK joins Sen. John McCain (R-Ariz.) and his columnist daughter Meghan McCain on “The Tonight Show With Jay Leno” (NBC at 11:35), with a musical performance from the Plain White T’s.

Actress Courteney Cox and “The Bachelor” Juan Pablo are on “Jimmy Kimmel Live” (ABC at 11:35), with music from Jonathan Rice.

RETURNING SHOW: Chris Hardwick’s “@midnight” (Comedy Central at midnight) returns for its second round with Kumail Nanjiani and Paul Scheer performing.

— Rachel Lubitz