BBC Four HD Saturday

Documentary following two tigers released into the wild to breed, where they must fight leopards for territory, learn to hunt boar and try to avoid being killed by poachers

David Attenborough looks at the evolution of amphibians 350 million years ago, when fish are thought to have crawled from water on to land, spawning newts, frogs and salamanders

Paul Rose recounts the story of an 18th-century French expedition to determine the shape of the Earth. Beset by problems from the start, the mission became a tale of death and woe

Irène follows a lead on a case involving Mirreau, who appears to be linked to a state secret, while at Les Damnés, the Baron discovers that Gisèle has fled

A German spy offers to find Gisèle in exchange for a favour, while the Sentinels must free Mazauric before he divulges information to the enemy

A schoolboy begins exhibiting strange behaviour, and his mother suspects bullying at his school and confronts his teacher. Japanese thriller, starring Sakura Ando

Realising Richard is bored with retirement, Hyacinth decides to provide him with a hobby - a move that backfires on her

The Meldrews set off for a seaside break - but the discovery of a dead gull in their boarding-house bathroom sets the scene for what turns out to be a nightmarish weekend

David Attenborough looks at the evolution of amphibians 350 million years ago, when fish are thought to have crawled from water on to land, spawning newts, frogs and salamanders

Paul Rose recounts the story of an 18th-century French expedition to determine the shape of the Earth. Beset by problems from the start, the mission became a tale of death and woe