Invictus: The Road to the Games (BBC1, 7pm)

THE second Invictus Games is being held in Orlando, Florida, from Sunday until Thursday, May 12, and involves 110 injured British servicemen and women competing in this alternative global Paralympics-style, which is the brainchild of Prince Harry. Highlights will be shown on BBC1.

Named after Invictus, the Latin for Unconquered, Undefeated, the 2014 games in London were a resounding success with around 300 competitors from 13 countries competing in athletics, archery, indoor rowing, powerlifting, road cycling, sitting volleyball, swimming, wheelchair basketball and wheelchair rugby.

Apache helicopter pilot Prince Harry spent ten years in the Army and told TV Times about meeting the UK team: "I get inspired by them. How could you not be inspired by the, just seeing what they do? No one wants sympathy. all they want is an opportunity to prove themselves and that's what this is all about.

"Some of these guys should be dead. Never before have we had so many amputees survive from such unbelievably traumatic injuries. I'm now lucky enough to watch someone who should be dead run the 100 metres."

The prince met President Barack Obama to promote the games and has seen the number of competing countries rise from 13 to 15.

Prince Harry reflects that his own crisis period came in 2008 when he was ordered to leave his first tour of duty in Afghanistan.

"After ten weeks I got extracted, literally plucked out of my team and, and yes, there was an element of me thinking, 'I'm an officer. I'm leaving my soldiers and it's not my own decision'. I was broken. I didn't know what was going to happen to them and then suddenly I find myself on a plane that's delayed because a Danish solider's coffin was put on board. While I'm sitting there, I look through a curtain in the front and see three of our lads wrapped up in plastic, missing limbs. One of the guys is in a coma.

"And, suddenly, I thought, 'People don't get to see this'. I never, in those ten weeks, saw the injury part. I only heard about it. That's how it all started for me. From that moment I knew I had the responsibility to help all veterans."

He also hopes that the event will also change people's attitudes towards mental illness.

"One thing we have to talk about more is breaking down these barriers around so-called invisible injuries like Post-Traumatic Strees, just as we have for physical injuries like the loss of a limb. This fear of coming forward as a result of the stigma that surrounds mental health is one of the greatest challenges that veterans face today."

In this one-off preview documentary, Nick Knowles shares the inspiring stories of men and women in the armed forces as they vie for a place in the UK Armed Forces Team at Walt Disney World.

During the programme, Nick also meets the competitors' families and celebrates their bravery and achievements.

Marcella (ITV, 9pm)

WOULD the Met really take back a police officer ten years after they quit and immediately assign them to a major murder case at the same rank? Those who have been able to ignore the plot holes have been rewarded with a gripping tale. This week, Mo holds the police responsible when Hassan is shot, while Marcella triumphs over Peter Cullen and finally gets the information she is after relating to Grace's death. Jason manages to get his job at DTG back – but at what cost? – and deliveryman Ronnie makes the mistake of his life.

The Island with Bear Grylls (C4, 9pm)

THE group has been marooned for a month without a sustainable food source and sufficient shelter to protect them from the brutal tropical storms, and their bodies start to fail. In desperation, the women muster the energy to make one last push to look for food, while Simon leads a hunt into the jungle for the most dangerous predator on the island – the caiman crocodile. Last in the series.

Viv Hardwick