60 Days In This new docu-series follows seven volunteers who agreed to go under cover as inmates in order to probe allegations of corruption at a county jail in Indiana. 9 p.m. A&E
Elementary In this new episode, Holmes and Watson (Jonny Lee Miller, Lucy Liu) probe a case inspired by Arthur Conan Doyle's classic Sherlock Holmes thriller "The Hound of the Baskervilles." Tom Everett Scott ("Southland") guest stars. 10 p.m. CBS
Portlandia Kevin Corrigan ("Grounded for Life") guest stars on a new episode of the quirky comedy. 10 p.m....