Megastunts: Highwire Over Niagara Falls (9pm, ABC) - Live coverage of daredevil Nik Wallenda (at right in an Associated Press photo) as he attempts to walk a tightrope across Niagra Falls, a feat that has been banned since 1890.
Fairly Legal (9pm, USA) - In the Season 2 finale, Kate looks into the firing of a lesbian couple and uncovers a scandal that could involve DA Davidson.
The Ricky Gervais Show (9pm, HBO) - Topics include the origins of the universe and the evolution of creatures other than humans.
Common Law (10pm, USA) - The guys investigate a series of home invasions by a group of thieves and learn that Travis' foster brother could be their leader.
Louisiana Lockdown (10pm, Animal Planet) - An infiltration of drugs tests the security staff's ability to enforce the rules, and an assistant warden tries to find a balance between work and motherhood.
Comedy Bang! Bang! (10pm, IFC) - Amy Poehler is confronted about her hair and her feud with Mad Magazine.