An exclusive trailer released today previews an autobiographical film about rugby legend Jonah Lomu, 20 years on from his explosive Rugby World Cup performance in South Africa.

Lomu became the world's most famous, and feared, rugby player and gained that reputation during the 1995 Rugby World Cup in South Africa.

He went to the Republic with only two All Blacks caps to his name but returned a phenomenon, having scored seven tries in five matches including four in the semifinal against England.

Lomu returned to South Africa recently on the eve of the 20th anniversary of the tournament to film parts of his autobiographical movie.

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In this trailer, he visits one of the Vuka schools in Mitchell's Plains and gave a motivational speech to them and catches up with some 'old enemies' in Francois Pienaar and Joost van der Westhuizen.

A released date for The Book of Jonah - co-produced by Lomu himself - hasn't yet been announced.

The trailer features footage from the 1995 World Cup and words from rugby great.

"I came from an area where I was told I was never going to play rugby at the top level and I ended up coming here in '95 and making my name here and it just went on," he tells the camera.

"Dreams can happen."