Terrestrial Life in Cold Blood BBC1, 9pm The intimate lives of crocodiles, turtles and tortoises. Sir David Attenborough begins the story of these ancient, armoured giants in the Galapagos Islands with the biggest and most long-lived of all reptiles: giant tortoises. Observing the difficulties they face, David rightly states: "Making love in a suit of armour is not easy." But just how does he know?

Stephen Hawking: Master of the Universe Channel 4, 9pm Twenty years after A Brief History of Time became an unlikely global bestseller, Stephen Hawking considers how far our understanding of the universe has developed, and introduces scientific ideas that weren't even imagined two decades ago. The series also explores how Professor Hawking overcame a life-threatening diagnosis to become the most famous physicist alive. The first programme charts his quest for a theory that explains everything.

Damages BBC1, 10.35pm By the silvery white hair of Ted Danson! Developments push the Frobisher case towards David Connor's murder as Gregory Malina emerges from hiding. Tom and Ellen press George Moore to help Patty with the case - still unaware that he is the devil's accomplice. Moore deviously encourages Ellen to investigate a car accident involving Frobisher and a young woman which happened in Virginia 25 years ago. Glenn Close looks on, smiling in her pinstripe power-suit.

Digital Raines ITV3, 9pm Despite making progress in his therapy sessions with sassy Dr Kohl, quirky homicide detective Raines remains troubled by his hallucinatory conversations with murder victims - especially so while investigating the death of a 10-year-old girl.

Mrs In-Betweeny BBC3, 9pm Amelia Bullmore stars in a darkly comic look at modern British family life that was co-created by Paul Abbott (Shameless) and Caleb Ranson (The Outsiders). The Winslow kids think life sucks. Their parents are dead, but still manage to embarrass them: how could they have parked in the exact spot where a lump of frozen urine would land from a passing plane? Uncle Neil is just plain hopeless: too knackered from meeting his sex-mad girlfriend's demands and keeping their granny away from her newly-developed passion for erotic toys and vodka. When their saviour, Uncle Brendan, arrives to make it all better, the kids discover he's now Aunt Emma and has more attitude than they could ever imagine.

David Jason - Frost and Me ITV3, 10pm Start of a two-week Frostathon, offering 10 of David Jason's fave episodes, starting with the opener. While investigating the disappearance of a child, Jack Frost inadvertently digs up a 30-year-old skeleton chained to an empty but locked strongbox. At the same time as working to solve the mystery, Frost is also nursing his terminally ill wife.

Radio 1968: Rivers of Blood - The Real Source Radio 4, 8pm Forty years ago Enoch Powell, one of the most brilliant thinkers of his generation, effectively ended his career as a mainstream politician with a speech on immigration which became infamous because of its inflammatory oration. A classical scholar, and a Tory, Powell took the phrase, "rivers of blood" from Virgil's Aeneid. Here Rob Shepherd examines the origins of the speech and its impact on society.