Also showing April 16: ‘One Strange Rock’ on NatGeo.

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“Scorpion”

Season four finale; the team heads to Northeast Africa, where they face a blinding sandstorm in a minefield they have to clear to save the lives of local villagers; setting up drama for season five next year, Paige and Walter’s relationship takes a shocking turn, and Toby and Happy make an important decision; 10 p.m. Monday on KIRO.

Also on Monday

“American Idol,” 8 p.m. (KOMO): Twelve of the top 24 finalists perform duets with celebrity partners.

“The Voice,” 8 p.m. (KING): The singing contest enters playoff rounds with voting.

“Supergirl,” 8 p.m. (KSTW): When Winn’s father dies, his estranged mother tries to reconnect with him; a copycat Toyman attacks; Mon-El tells Kara something important about the Worldkillers.

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“Lucifer,” 8 p.m. (KSPQ): Lucifer and Chloe investigate a murder where a witness claims an angel saved her life; Pierce and Chloe’s relationship takes a turn; Lucifer discovers something that could change everything.

“Man With A Plan,” 8:30 p.m. (CBS): When Adam learns that Andi is keeping secrets from him for his own good, he’s determined to find out what she’s hiding from him.

“The Terror,” 9 p.m. (AMC): A strange illness begins to show itself; the captain’s judgment is jeopardized.

“One Strange Rock,” 10 p.m. (NATGEO): A look at the dynamic primordial forces and coincidences that led to the genesis of Earth’s intricate life-forms.

“The Crossing,” 10 p.m. (KOMO): Reece faces off with her pursuers; Jude’s time with his son leads to a terrifying ordeal; Hannah escapes for her first look at the outside world.

Madeline McKenzie: mmckenzie@seattletimes.com. Program times may vary depending on your cable provider or service.