As he appears on Channel 4's The Hunted for charity, here's what you need to know.
Who is Johnny Mercer?
Johnny Mercer, 37, has been the Tory MP for Plymouth Moor View since 2015.
He grew up in Dartford, Kent, one of eight children to their banker father and nurse mum.
Three of his brothers served in the Royal Navy.
Johnny went to Sandhurst to train as an officer in the Army, and was posted to Afghanistan during his 12-year military career.
He has admitted he was not political until recently and the first time he voted was for himself.
But he was tipped as a Tory rising star after a maiden Commons speech on veterans' mental health.
He has served on the Defence Committee and is now on the Health Committee.
Mr Mercer has criticised Mrs May for not doing enough to help needy ex-servicemen, and blasted "witch hunt" probes in Northern Ireland.
In June he turned have-a-go hero as he tackled a racist thug who was stealing from a shop.
It also emerged he has spoken at 90 Tory grassroots dinners, sparking claims he is being groomed as a future PM.
He lives in Devon with his wife Felicity, who he met at school, and their two children.
Why is Johnny Mercer taking part in The Hunted?
The MP is among the celebrity line-up for a charity edition of the reality show for Channel 4's Stand Up to Cancer.
The contestants have to go on the run as a team of experts try to track them down.
Mr Mercer is teamed up with Sky News presenter Kay Burley.
Viewers will see them evade a team of hunters by hiding out on a boat off the Devon coast.
The show, which begins on October 16, was filmed in the summer.
The MP said: “Every year I use the immensely privileged position of being a Member of Parliament to raise money for charity. Last year I cycled around the Low Countries raising thousands of pounds for Help for Heroes.
“This year I am taking part in Hunted which is for Stand Up To Cancer.
"I am acutely aware of my parliamentary duties and have incorporated these into filming which people will see when they tune in."
The other contestants are Love Island's Chris Hughes and Kem Cetinay, Strictly Come Dancing pair Louis Smith and AJ Pritchard, and comedian Dom Joly and Vicky Pattison.
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