Empire (8 p.m., Fox) – In the two-hour Season 1 finale, Lucious has a secret that’s about to change everything. Also, Hakeem tries to figure out the best move for his career, and Cookie comes up with a plan to get herself back on top. Snoop Dogg guests stars as himself.
Walking the Nile (8 p.m., Animal Planet) – Explorer and former British Army paratrooper Levison Wood begins his 9-month, 4,250 mile trek along the river Nile. The journey takes him from a rainforest in Rwanda, through Tanzania and ends in Uganda. Three episodes air tonight.
Arrow (8 p.m., CW) – A new villain known as Murmur (his mouth has been sewn shut) terrorizes Starling City.
CSI: Cyber (10 p.m., CBS) – A car service company’s dispatch software is hacked to target specific passengers.
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The Untold Story of ‘The Sound of Music’ (10 p.m., ABC) – Diane Sawyer travels to Austria with actress Julie Andrews to explore the mysteries of the legendary film, revealing behind-the-scenes stories and re-tracing the steps of the real von Trapps, who defied the Nazis and were forced to leave the country they loved.