The 15th series of reality TV show Big Brother will kick off tonight in the first of two live shows.

Rebranded as Big Brother: Power Trip, this year’s housemates are to face a series of mind games under the new theme of ‘power’.

Housemates are still being kept secret, but it has been revealed that contestants will have sat an IQ test before being selected.

The show, which is filmed in Borehamwood, will also include exciting new features and plot twists, plus of course the new-look house.

Host Emma Willis will kick off the show tonight at 9pm on Channel 5, with a second launch show at 9pm on Friday.