Wee Oscar had his game face on for Monday's launch of the special night of boxing, which will be the first time ever that Belfast City Hall will host such an event.
A fantastic bill has been put together for the night which will help raise funds for the Oscar Knox Appeal.
Little Oscar, who is four, has been fighting neuroblastoma, a rare and aggressive cancer for much of his life.
He travelled to America last year for a potentially-life saving treatment, but had to return home when as he was found to have a heart and lung condition and couldn't go forward with the programme.
Since then Oscar has been receiving medical attention in Northern Ireland and his family has been fundraising for additional treatment.
His father, Stephen explained how the event came to be organised.
"This has just been a fight from day one, losing is not an option," he said.
"We had Tierna Cunningham, the deputy mayor very kindly take Oscar's Appeal on as one of her nominated charities for the year so that gave us use of City Hall."
"He's so full of beans, he's really psyched up for boxing," Oscar's mum Leona added.
"He absolutely loves Paddy Barnes that's really inspired him to get involved. He's really excited to be here today and see everyone."
The show will feature five contests of professional boxing and is headlined by Belfast's Kevin O'Hara versus Dublin's Noel O'Brien who will fight for the Irish Light Welterweight Title.
'Sweet Pea' O'Hara said he jumped at the chance to take part in the fundraiser for Oscar.
"We're all fighters, but he is a real warrior," he told UTV.
"I have a young boy myself and seeing that kid running about today it's an honour to fight in City Hall in his name."
The event takes place on 14 May and tickets are available from the Belfast Welcome Centre.