“American Idol” 7 p.m. to 9 p.m., Fox (New, live)
The final three singers each perform three songs — one chosen by the judges, one picked by the mentor and a third chosen by the singer.
“Nature” 7 p.m., PBS (New)
This special looks at koalas that live in the suburbs of Brisbane, Australia. The cuddly creatures are dealing with overcrowding and the encroachment of civilization. The work of two biologists is also highlighted. They are trying to decipher the animal’s communication methods.
“Trash Inc.: The Secret Life of Garbage” 7 p.m., CNBC
Everything you wanted to know about the garbage industry, including how landfills are being used to generate power.
“Betty White’s Off Their Rockers” 7 p.m., NBC (New)
One prankster is particularly handsy while another plays a skydiver looking for directions.
“The Middle” 7 p.m., ABC (New)
Frankie gets youngest son Brick to snitch on his older siblings but dad Mike isn’t so thrilled about the tattling. Meanwhile, Sue blackmails Axl to do her bidding.
“Suburgatory” 7:30 p.m., ABC (New, season finale)
Tessa feels left out when her friends celebrate mothers in the community.
“Criminal Minds” 8 p.m. to 10 p.m., CBS (New, season finale)
A federal bank is under attack and hostages have been taken, including a member of the B.A.U. team. And another team member says goodbye.
“Modern Family” 8 p.m., ABC (New)
Alex’s school project about family harmony isn’t coming together very easily as the whole clan finds reasons to disagree.
“Don’t Trust the B in Apartment 23” 8:30 p.m., ABC (New)
James freaks out when a scandalous tape could jeopardize his status on “Dancing With the Stars.”
“Revenge” 9 p.m., ABC (New)
Victoria’s newest collaboration causes trouble for Conrad and a vengeful Charlotte wants to get even with Declan.
“Hot in Cleveland” 9 p.m., TV Land (New)
An artifact in an abandoned storage unit requires the expertise of Artie Firestone.
— Laura King
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