D-Day Sacrifice (9pm, National Geographic Channel) - This special documentary series tells the story of D-Day, starting with the events that led up to the invasion of Normandy by the Allies in World War II. At 10, the Allied forces liberate Paris from Nazi control.
Also on tonight . . .
So You Think You Can Dance (8pm, Fox) - The second round of auditions features hopefuls in Chicago and Los Angeles. Guest judges include Jenna Elfman, Fabrice Calmels and Christina Applegate.
The 100 (9pm, CW) - In the first part of the two-part season finale, Clarke and Finn face a new enemy, while Bellamy saves Jasper.
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Motive (10pm, ABC) - Flynn and Vega investigate the drowning death of a socialite and an unlikely party becomes a suspect in the case.