Snowfall
10.30pm, BBC Two
The late John Singleton’s riveting drama on the early days of the 80s LA crack epidemic comes to the end of its third season with another bang. The double bill opens in the aftermath of last week’s brutal shooting as Franklin tries to lie low with his family, and reckons with his increasingly precarious position. Meanwhile, we witness an alternate timeline that shows what his life could have been like had he gone to college. Poignant and artfully paced, it is a fitting finale for this engrossing series. Ammar Kalia
The Windsors: Secrets of the Royal Tours
7pm, Channel 4
It has been a rough few months for the Windsors. But this series has focused on royal excursions that haven’t involved New York bachelor pads. The final episode looks at the 1990s, particularly Princess Diana’s campaigns and the first sorties by the Duke and Duchess of Cambridge. Phil Harrison
Building the Billion Pound Mega Bridge
7pm, Channel 5
With only three months until it is due to open, engineers are rushing to complete Montreal’s Samuel De Champlain Bridge, ready to carry 1m vehicles per week. In this doc they reveal its innovations, including expansion joints that can withstand temperatures ranging from -30C to 35C. AK
Great American Railroad Journeys
8pm, BBC Two
Michael Portillo is still riding the rails in this cross-country travelogue, this week taking Canada’s Ocean Line to Quebec City. Along the way, he dons a kilt to recreate an 18th-century Scottish Highland regiment and also learns of the horrific 1917 explosion in Halifax harbour that killed 2,000 people. AK
Hidden
9pm, BBC Four
The rain-sozzled Welsh whodunnit becomes more noir with every episode, under the deadpan stewardship of DCI Cadi John. This week, her line of questioning once again turns to Karl Lewis, but it’s queen of the false testimony Mia who’s really deserving of her attention as the hunt for the killer continues. Gripping stuff. Hannah Verdier
Casualty
9.10pm, BBC One
The moment has come for Luka’s surgery. His parents, Faith (Kirsty Mitchell) and Lev (Uriel Emil) have had a long, lonely struggle getting here, but now the emergency department is rallying round. Perhaps it’s that same camaraderie that Charlie is seeking by returning to work so soon after Duffy’s death? Ellen E Jones
Film choice
Summertime, 12midnight, BBC Two
Paris, 1971, and love is in the air, as farmer’s daughter Delphine falls giddily for feminist campaigner Carole. When Delphine’s father is taken ill, they head back to the homestead, where the forces of freedom and desire clash with rural convention, in Catherine Corsini’s sprightly romance. Paul Howlett
Live sport
Premiership Rugby Union: Harlequins v Exeter Chiefs 2.30pm, BT Sport 2. Live from Twickenham Stoop.
Premier League Football: Watford v Liverpool 5pm, Sky Sports Main Event. The relegation-threatened side seek an upset at Vicarage Road.
FA Women’s League Cup Football: Arsenal v Chelsea 5.15pm, BT Sport 1. The final from City Ground.
