Jordan Peele, Keegan-Michael Key (l-r) on "Key & Peele.” (Danny Feld/Comedy Central)

RETURNING SHOW: CBS is really aiming to ramp up the drama on Season 27 of “Survivor” (CBS at 8 p.m.), which will be known as “Blood vs. Water.” Former contestants bring along a loved one to the jungle, and then in a twist that they fail to see coming, are split into tribes that will compete against each other.

RETURNING SHOW: The mini pageant contestants are back on a new season of “Toddlers & Tiaras” (TLC at 8), which starts in the South at a contest in Clarksville, Tenn.

RETURNING SHOW: It’s Leslie and Chris’s wedding day on the third season of “Tyler Perry’s For Better or Worse” (at 9), which starts on a new network, moving from TBS to OWN, thanks to Perry’s best friendship with Oprah. In the opener, after Leslie’s ex-boyfriend gets in a serious motorcycle accident, she considers calling off the nuptials.

Documentary “Rise of the Machines” (CNBC at 9), hosted by correspondent Melissa Lee, looks at how robots will someday run the world — or more specifically, how technological sensors are already shaping our daily lives. Included: cars that don’t need drivers and household devices that learn the habits of their owners.

FINALE WATCH: It’s been a long, strange, controversial season of “Big Brother” (CBS at 9:30), one that required the network to post a disclaimer before every episode warning people that it might be offensive. In the finale, GinaMarie, Spencer and Andy compete for the final head-of-household position; and when the remaining two are decided, the eliminated houseguests come back to vote for the winner of the $500,000 prize.

RETURNING SHOW: Comedians Jordan Peele and Keegan-Michael Key are back with a third season of sketch comedy show “Key & Peele” (Comedy Central at 10), starting with a new character (an inner-city substitute teacher) and later, a parody of “Les Misérables.”

“Late Show With David Letterman” (CBS at 11:35) hosts actor Bryan Cranston, actress Amanda Seyfried and musical guests Michael Franti and Spearhead.

“The Voice” coach Christina Aguilera, talk-show host Joy Behar and musical guest Valerie June are on “The Tonight Show With Jay Leno” (NBC at 11:35).

Actor Aaron Paul and actress Hannah Ware are on “Jimmy Kimmel Live” (ABC at 11:35), along with a performance by Jim James.

— Emily Yahr