The housemates are awoken early morning in tonight's episode of Celebrity Big Brother, on their fourth day in the Big Brother house.
Loud and electronic distortion can be heard from the bedroom, with the lights malfunctioning throughout the compound, and it's only when the housemates head to the garden that they realise a UFO has crash landed in their garden.
After being told that the housemates will be summoned by the aliens onboard to complete an array of tests, Liz and Lee enter the UFO through a hatch into the spaceship for their part in 'Pain Threshold'.
Observing that celebrities seem to be extremely 'thick skinned', due to the assaults on their personality by 'earth media', the aliens wonder if those deemed famous have a higher pain threshold than 'normal' people.
To test Liz and Lee's physical pain limits, three 'hi-tech' Martian devices are used - an elastic band slapping device that slaps each celebrity on the forehead, an electric hair removing epilator that strips the hair off Liz's arm and Lee's chest, and the neon electro wand, that gives off visible sparks of static electricity when it touches bare skin, causing painful shocks.
Catch the action in tonight's episode of Celebrity Big Brother, on Channel 5 at 9pm. Watch Liz and Lee take on their challenge below.
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