Dr Lance O'Sullivan also confronted an anti-vaccine advocate outside a screening of a controversial film that incorrectly links vaccines to autism.

The heated discussion took place after the screening of Vaxxed in the Northland town of Kaitaia on Monday.

O'Sullivan had already protested the screening earlier, storming the stage to tell those gathered he was not there to see the movie.

MONIQUE FORD / Stuff.co.nz Dr Lance O'Sullivan, Northland, says why he jumped on stage at a screening of the movie Vaxxed in Kaitaia.

The ​2014 New Zealander of the Year said he had come to the screening "​to continue my battle and my challenge for my people ... and importantly, for our children".

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"I come here with a lot of anger ... and that's because I am adamantly opposed to this because this position, this idea of anti-immunisation has killed children around the world and actually will continue to kill children ... whose parents are put off immunisation because of misinformation - misinformation based on lies, quite frankly," he said.

MONIQUE FORD/FAIRFAX NZ Dr Lance O'Sullivan, Northland, who jumped on stage at a screening of the movie Vaxxed in Kaitaia

Later, outside the venue, O'Sullivan and event organiser Tricia Cheel butted heads.

Cheel told the doctor vaccines "destroyed her life".

"I appreciate your conviction, I appreciate your work, I appreciate what you're trying to do throughout the community - but let's look at what I'm trying to do in the community," she said.

"I've had my sons damaged by your vaccines, I've had my life destroyed by your vaccines - and I'm not going to stand by and do nothing about it. Do you understand that?"

O'Sullivan said he believed Cheel needed to remember the message he'd delivered earlier in the evening: "You will be responsible for children dying here in Kaitaia. You will be responsible," he said.

Cheel said she wasn't convinced by O'Sullivan's message.

"You are just as much responsible! You come and see the damage your vaccines have done to these children before you start talking to me about that!" she said.

Then O'Sullivan invited Cheel to come to the hospital to see the effects of refusing to vaccinate children.

"You come up to the hospital and see the ravaged bodies [of unvaccinated children]. You sleep on what you've come to Kaitaia to bring," he said.

Vaxxed - From Cover-up to Catastrophe has been shown in eight locations around the country to more than 1200 people since its New Zealand premiere last month. It has also been banned from film festivals around the world for its inaccurate messages.