The Big Bang Theory
8pm, E4
And so it came to pass that the geek inherited the Earth – in the form of this sitcom about socially awkward Caltech scientists becoming the most-watched show on US television. After 12 seasons of mental gymnastics and social ineptitude, how will it all end? The title of this double-bill finale, The Change Constant/The Stockholm Syndrome contains a clue: it seems Sheldon (Jim Parsons) and Amy’s (Mayim Bialik) Nobel prize dream is about to be realised. Surely it can’t be as simple as that? Ellen E Jones
The Secret Life of the Zoo: Underwater Special
8pm, Channel 4
Overlooked by an audience hungry for hippos and lions, the aquatic inhabitants of Chester Zoo get their chance to shine. Tonight: a bid to rescue rare salamanders and, because it’s compulsory to have penguins in all nature shows, the Humboldt equivalent of Love Island. Mike Bradley
Big Animal Surgery
9pm, BBC Two
Liz Bonnin is your host for big-league veterinary action, offering a fascinating glimpse of essential, often experimental surgery. The operations are filmed in real time as the world’s best vets get to work. There is an element of danger, but also an insight into the inner workings of the wild beasts involved. Hannah Verdier
Riviera
9pm, Sky Atlantic
As a new chapter of the preposterous Côte d’Azur thriller/soap opens, Georgina Clios returns after the fateful “little trip” she made with stepson Adam at the close of season one, only to receive a mysterious message. Now Juliet Stevenson joins the cast and her character is hiding an even bigger secret. MB
Ian Huntley: 5 Mistakes That Caught a Killer
10pm, Channel 5
The murders of schoolgirls Holly Wells and Jessica Chapman in 2002 almost went unpunished. This documentary sets out the errors that the killer, Ian Huntley, made that enabled police to prove his guilt. The star witness is former detective chief superintendent Chris Stevenson. Jack Seale
The Other Two
10pm, E4
Saturday Night Live writers Chris Kelly and Sarah Schneider are the brains behind this new US comedy. Hopeless millennials Brooke and Cary Dubek are struggling in New York when suddenly kid brother Chase, 13, hits the big time in the guise of viral star Chase Dreams. A wry take on the perils of celebrity. MB
Film choice
Black Sheep (Jonathan King, 2006), 2.35am, Horror Channel
Ovinophobic New Zealand sheep farmer Henry Oldfield (Nathan Meister) is the butt of many a joke, but he gets his own back when an experiment turns his flock into people-eaters. Director Jonathan King plays this for the laughs such a wacky story deserves, and the special effects are supplied by Peter Jackson’s firm. Paul Howlett
Live sport
Cycling: Giro d’Italia 12.15pm, Eurosport 1. Coverage of stage 12 of the Grand Tour race.
Darts: Premier League play-offs 7pm, Sky Sports Main Event. Four players compete for the title won by Michael van Gerwen last year.
Football: Premiership play-offs 7.15pm, BT Sport 1. Dundee United or Inverness v St Mirren or Hamilton.
