Kevin Moran: Codebreaker tells the unique story of the former GAA and football star, it's live semi-final time on Britain's Got Talent, and there’s the last-ever episode of Succession . . .
Pick of the Day
Kevin Moran: Codebreaker, 9.35pm, RTÉ One
Streaming on RTÉ Player
Following on from last week’s fascinating documentary about Irish communists, here’s another film directed by Kevin Brannigan, who also helmed Kerr’s KIds and In League With Gaddafi.
A profile of the former footballer and GAA star Kevin Moran, who won two All-Ireland Senior Football Championships with Dublin in the 1970s and went on to play for Manchester United and represent Ireland in Euro '88 and Italia '90.
Featuring interviews with Moran, as well as Packie Bonner, Bryan Robson, Norman Whiteside, Paul McGrath, Peter Reid, Ian Rush and Neville Southall.
Don’t Miss
Britain's Got Talent, 8.00pm, Virgin Media One
Ant and Dec (below) host the first live semi-final of the talent contest, welcoming back acts that impressed judges Bruno Tonioli, Simon Cowell, Amanda Holden and Alesha Dixon during the auditions episodes in London and Manchester, in addition to a number of Golden Buzzer acts.
Join presenting duo Ant and Dec and judges Simon Cowell, Alesha Dixon, Amanda Holden, and Bruno Tonioli as their search for the best talent in Blighty hots up.
After weeks of captivating (and jaw-dropping) auditions, Britain’s Got Talent draws closer to crowning its season 16 winner as the spectacular semi-finals get underway.
You catch the live semi-finals from tonight and every weeknight at 8pm until Friday.
Steeltown Murders, 9.00pm, BBC One
Through ground-breaking, familial DNA technology, the team in 2002 are given a breakthrough in their investigation and manage to locate the killer.
Meanwhile a flashback to 1973, South Wales Police still struggle to find their killer, and with external pressure from the press, the force decides to put their trust in 60-year-old Dutch medium Gerlad Croiset.
Once Upon a Time in Northern Ireland, 9.00pm, BBC Two
Last week’s opening episode was really intersting and this week’s comes witrh the intriguing title Do Paramilitaries Lie Awake at Night?
It takes a look at the growth of paramilitary organisations in the early 1970s, with killings, explosions, intimidation and street disorder becoming widespread - with devastating and often lasting effects.
Coercive control, intimidation, beatings and executions were part of how these groups operated in their different communities, a world in which people could be 'disappeared', never to be found for decades afterwards.
Rescue: Extreme Medics, 9.00pm, Channel 4
This week the trauma team rush to 67-year-old Walter, who has sustained a life-threatening head injury after falling down a remote hillside while walking with his sister.
In Aberdeen, 62-year-old Liz has been rushed to hospital with a serious chainsaw cut to her arm, while 52-year-old Philip has crashed his motorbike at high speed and is lying in the central reservation of the motorway.
New or Returning Shows
Katharine Hepburn: Call me Kate, 8.00pm, Sky Arts
Streaming on NOW
Katharine ‘Kate’ Hepburn was definitive and distinctive, a force of nature, a once-in-a generation talent, whose progressive and free-spirited nature defined her roles.
She was nominated for twelve Academy Awards, winning a record four for Best Actress, and appeared in many movies that are now regarded as true classics of cinema.
Her life and career were defined by stunning highs and crushing personal lows - but she also remained in control of her own story, and her distinctive defiance and enduring talent make her an icon to generations of women today.
As she herself said: "I never realised until lately that women were supposed to be the inferior sex."
This is a documentary for the outcasts, the misfits, the girls and boys uncomfortable in their own skin, who don’t conform with traditional expectations.
Billy the Kid, 9.35pm, RTÉ2
Drama about the early years of Wild West outlaw Billy the Kid, starring Tom Blyth and Jonah Collier.
An immigrant Irish family leave New York and travel west in search of new opportunities. They join a trail of wagons and along the way an elderly driver teaches 12-year-old Billy the ways of the Wild West.
Those ways include shooting - and the youngster soon begins to develop his own sense of justice.
Springwatch, 7.30pm, BBC Two
As the series returns for a 19th season, and Michaela Strachan present from their new base at RSPB Arne in Dorset, where nest cameras are rigged and ready to capture all the drama of the season. 
Iolo Williams is out and about explores the neighbouring Purbeck Heaths national nature reserve, while Gillian Burke sets off to explore Snowdonia National Park.
Ending Today
Succession, 9.00pm, Sky Atlantic
Streaming on NOW
It’s Season 4, episode 10. In other words, the last ever episode of this potty-mouthed drama about a wealthy media tycoon’s family and their struggles for control of their empire.
The sale of media conglomerate Waystar Royco to tech visionary Lukas Matsson (Alexander Skarsgård) moves ever closer. Or does it?
The prospect of this seismic sale provokes existential angst and familial division among the Roys as they anticipate what their lives will look like once the deal is complete or quashed.
University Challenge, 8.30pm, BBC Two
Jeremy Paxman (below) asks the questions as two teams battle it out in the grand final of the student quiz that’s been around in one form or other for more than half a century.
The contestants will be endeavouring to succeed last year's winners Imperial College London and become the 52nd champions, carrying off the trophy designed by Manchester sculptor Adrian Moakes.
