Person of Interest (10 p.m., CBS) – In the Season 4 finale, Root and Finch race to save the machine after Samaritan locates it. Meanwhile, Reese is caught in a showdown between Elias and Dominic.
Also on tonight . . .
The Flash (8 p.m., CW) – Barry deals with the latest threat from the Reverse Flash, and Dr. Wells distracts the team by releasing Grodd on the city.
New Girl (9 p.m., Fox) – The fourth season ends with Coach preparing to move out and Schmidt deciding to go through his own stuff as well.
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Weird Loners (9:30 p.m., Fox) – The first mini-season of this show ends with the gang visiting a lesbian bar, where Caryn and Stosh compete for the same woman. Nothing is final, but this isn’t likely to be renewed.
Frontline: Outbreak (10 p.m., UNC-TV) – The inside story of how the Ebola outbreak began – and why it wasn’t stopped – exposes the missteps in response to the epidemic.
Forever (10 p.m., ABC) – In the first season (perhaps series) finale, Jo is all that stands in the way of Henry and Adam’s impending clash, while Adam exploits Henry’s concern that Jo will learn his secret.
Younger (10 p.m., TV Land) – When her ex fails to come through with his half of their daughter’s tuition, Liza resorts to some sketchy endeavors to earn quick cash.
Inside Amy Schumer (10:30 p.m., Comedy Central) – An all-male jury argues over Amy’s fate.