American Idol (8 p.m., Fox) – The show announces their top four finalists, who then perform two songs each. Judge Harry Connick Jr. also performs.
Supernatural (9 p.m., CW) – Oliver goes through a transformation, and Laurel asks Felicity and Diggle to help Nyssa face the League of Assassins.
Criminal Minds (9 p.m., CBS) – The BAU tracks a vigilante in Los Angeles who is shooting people who have possible ties to criminal activity.
Chicago PD (9 p.m., NBC) – Another crossover episode with “L&O: SVU” (10 p.m.), this one involving similar rape/murder cases in Chicago and New York.
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blackish (9:30 p.m., ABC) – When Zoey starts acting out and pushes boundaries, Dre and Bow disagree on how to handle her bad behavior.
Ripper Street (10 p.m., BBC America) – The third season debuts with a locomotive disaster, which sets Reid and Long Susan on a collision course.
CSI: Cyber (10 p.m., CBS) – The cyber team investigates when nine planes from the same airport undergo a coordinated Wi-Fi attack.