PBS NewsHour (7pm, UNC-TV) - In this special report, Robert MacNeil and Jim Lehrer look back at the Watergate scandal that began in the summer of 1973, transforming American politics and journalism and ultimately ending a presidency. MacNeil and Lehrer led PBS coverage of the Watergate hearings, co-anchoring all 250 hours of the proceedings. They share their memories and talk about how the experience forged their friendship and their journalistic partnership.
How Nature Works (8pm, National Geographic Channel) - A documentary looking at the interconnectivity of the millions of plant and animal species on Earth.
Nikita (8pm, CW) - Amanda puts her final plan into effect as the third season ends. Her diabolical plot places Nikita (Maggie Q, left) in a life-threatening situation and forces her to choose between saving Michael or herself.
Shark Tank (8pm, ABC) - The fourth season ends with two new back-to-back episodes. In the first, sharks hear about a jewelry line created by women with military experience and we get an update on the Scrub Daddy investment. At 9, two business school grads have an idea for a translation app, and an 11-year-old pitches his all-natural dog treats.
Fatal Justice (8pm, Lifetime) - A woman seeks justice for her family after her niece is seriously injured during a robbery. When the police fail to help, she takes matters into her own hands and learns that the men involved in the crime may also be responsible for her brother's murder 10 years earlier..
Real Time With Bill Maher (10pm, HBO) - Zach Galifianakis is Maher's mid-show interview guest tonight. Other guests include Richard Haass, president of the Council on Foreign Relations, S.E. Cupp, documentary filmmaker Michael Moore and journalist Andrew Ross Sorkin.
Merlin (10pm, Syfy) - An old flame reenters Mondred's life and tests his loyalty to Arthur.