Tonight in HD: April 22

Season Premiere: Call the Midwife (TV One, 9.30) Newly qualified midwife Jenny Lee begins her career at what she assumes is a small private hospital, but which turns out to be a nursing convent in the East End of London. Some British critics, like The Independent’s, were derisive of one of the BBC’s biggest hits in years: “The first thing that will probably strike you about the East End in 1957 is how spotlessly clean it all was. Yes, there are women brawling in the streets in a picturesque manner (one would expect nothing less), but there isn’t a bit of litter anywhere, let alone anything more noisome, and it seems that barely anyone at all smoked back then.” The Guardian likened it to another All Creatures Great and Small while The Daily Telegraph noted that “despite the tough subject matter, scriptwriter Heidi Thomas (Cranford, the revived Upstairs Downstairs) has created a programme that is family-friendly, heartwarming and gently humorous – in some ways typical Sunday night viewing after all – with an easy-listening soundtrack featuring Doris Day and The Four Aces.” The cast includes Spooks’ Jenny Agutter, Miranda’s Miranda Hart, Rosemary & Thyme’s Pam Ferris and Vanessa Redgrave. ✮✮✮✮

Sky Movies Premiere: Unknown (Sky 20, 8.30, 5.1) The plot for this assassination conspiracy thriller about an American in Paris who awakes from a coma without proof of his identity is absurdly complicated. But it’s a fun and enthralling two hours if you’re willing to suspend disbelief about the scenario that’s as clever as it is ridiculous. Jaume Collet-Serra (House of Wax) directs Liam Neeson, Diane Kruger and Mad Men's January Jones. (2011) ✮✮✮

Pretty Little Liars (TV2, 5.30) The girls finally reveal the torment ‘A’ has put them through to the one person they trust outside their group: Dr Anne Sullivan. ✮✮

The War at Home (TV2, 6.30, R) Dave suspects Hillary is pregnant when he finds a pregnancy test in the trash. However, he soon learns that a depressed, jobless Vicky has not been taking the pill. ✮✮✮

The Food Truck (TV One, 7.00) Chef Michael Van de Elzen tries to reinvigorate seafood takeaways, putting his creations to the test by setting up a roadside seafood cart near Waiwera. ✮✮✮✮

The Big Bang Theory (TV2, 7.00, R) After hearing Penny sing, Leonard lies to avoid seeing her perform. Sheldon goes one step further with a more elaborate lie, leading to the appearance of his non-existent cousin. ✮✮✮✮

Mike & Molly (TV2, 7.30) When Molly is overwhelmed with Thanksgiving preparations and wedding planning, she asks Mike to help, with mixed results. ✮✮

Touch (TV3, 8.30, 5.1) Martin gets his laptop stolen on the day Jake is scheduled for an important evaluation. As a result, he becomes ensnared in a young Salvadoran woman’s quest to avenge the death of her family. ✮✮

The Almighty Johnsons (TV3, 10.25, R) As something as simple as a virus turns the Johnsons’ world order upside down. ✮✮✮

Enlightened (TV One, 10.35) After learning about the deportation woes of a Mexican-born mother, Amy tries to motivate her co-workers to join her at a lunchtime rally for the family. ✮✮

Sky Movies Greats Premiere: The World's Fastest Indian (Sky 22, 8.30, 5.1) Ex-pat Roger Donaldson’s first New Zealand movie in 25 years ago was made on the smell of an oily rag but went like the clappers at the box office. It stars Anthony Hopkins as Burt Munro, a crazy old coot from Invercargill who, in the 1960s, broke world speed records on his ancient Indian motorcycle. It’s an amiable, mellow but meandering dramatisation that only gets into top gear near the end. (2005) ✮✮✮