Julianna Margulies and co sue the NSA on The Good Wife (11.20pm, RTÉ One), Richard Wilson and Simon Callow star in Playhouse Presents . . . Space Age (9.00pm, Sky Arts 1) while Rayna’s daughter meets a moody teenager in Nashville (10.00pm, More4)

The Good Wife, 11.20pm, RTÉ One

More courtroom capers with Julianna Margulies and co as the best show on TV continues its fifth season. Alicia and Cary sue the NSA on behalf of search engine Chumhum, unaware that Lockhart/Gardner’s connection to a former client has resulted in the spy agency monitoring the firm’s communications. Meanwhile, Alicia’s mother Veronica (Stockard Channing) takes steps to support her daughter, and Eli works to secure Diane’s Supreme Court nomination. The great Jeffrey Tambor returns as Judge Kluger.

Channel 4's Comedy Gala, 9.00pm, Channel 4

The all-star line-up for the annual comedy spectacular this year includes: Adam Hills, Aisling Bea, Alan Carr, Jack Dee, Jason Byrne, James Corden, Jo Brand, Jon Richardson, John Bishop, Jonathan Ross, Josh Widdicombe, Kerry Godliman, Kevin Bridges, Lee Evans, Michael McIntyre, Paddy McGuinness, Paul Chowdhry, Sean Lock, Seann Walsh, Warwick Davis - plus many more. Get ready for a night of laughter all in aid of raising money for a worthy cause.

Nashville, 10.00pm, More4

This cracking country drama offers compelling TV and should be mandatory viewing. This week, Rayna's daughters meet Luke's son Colt, a moody teenager with a big social media following. Juliette grows jealous of Avery's professional involvement with Scarlett and takes it out on her when they tour together to raise awareness of Rayna’s Highway 65 record label. Gunnar is reluctant to support Will and Layla's plan, and Teddy is angry when Maddie attends Deacon's latest concert.