Twenty years ago, nine people entered a purpose-built house to be watched 24/7 by Big Brother - and it changed TV forever.

Life inside the house was fascinating, unpredictable, uplifting, confronting, shocking, surprising, hilarious and, above all else, entertaining.

In 2020, the world’s greatest reality show returns to shake things up.

But if you think you know Big Brother, think again.

This time, everything has changed.

New generation

The thrilling new era of Big Brother begins with a dynamic new house full of incredible surprises, new rules designed to create show-stopping twists and a new generation of unique and ambitious housemates determined to outstay each other no matter what Big Brother throws at them.

On Wednesday night, the new host of Big Brother was revealed as Sonia Kruger.

The new host of Big Brother is Sonia Kruger Credit: Supplied

The experienced TV host is a familiar face to Big Brother fans having fronted the show from 2012 to 2014.

Sonia had previously been a major part of the Seven Network, co-hosting Dancing with the Stars and as an entertainment reporter for Sunrise and Today Tonight.

“I knew 2020 was going to be a fantastic year but to be asked to host the big daddy of reality shows is icing on the cake,” Sonia told 7NEWS.com.au.

RELATED: Big Brother start date confirmed by Seven Network’s Director of Programming

‘Addictive viewing’

“I’ve always loved Big Brother and this brand new series of the show will take it to an exciting, contemporary level that will make for addictive viewing.”

A Seven Network spokesperson told 7NEWS.com.au, “Big Brother has spoken and Sonia Kruger will helm the new game. Channel Seven is very excited to have Sonia on board for a thrilling new era of Big Brother.”

The new host of Big Brother is Sonia Kruger Credit: Supplied

Reggie Bird, who won the show’s 2003 season, said she’s thrilled the show is coming back.

“I think it’s wonderful.. I’m looking forward to it,” Bird told 7NEWS.com.au.

“I didn’t think that it ever would.”

Bird says she hopes the series brings in interesting housemates, and not “fake people”.

MELBOURNE, AUSTRALIA - NOVEMBER 21: Australian 'Big Brother' winner Reggie Bird at the 45th AFI awards held at Her Majesty's Theatre in Melbourne, Victoria, Australia. Credit: Regis Martin / Getty Images

Reggie won’t have long to wait as the housemates have been selected and are ready to play.

Aside from ‘Who are the housemates?’ another big question about Big Brother is, ‘Where will the house be located?’

Mind-blowing home

All we know at this stage is that it’s ‘on the edge of the world’.

“The new home is mind-blowing and Big Brother is as mischievous as ever,” Sonia said.

“The game has changed and I can’t wait to give fans their all-access pass to the greatest reality show on earth!”

A launch date for Big Brother 2020 is still to be announced.

The official Big Brother accounts are:

Instagram: @bigbrotherau

Facebook: www.facebook.com/bigbrotherau

Twitter: @bigbrother_au