After being saved from eviction by the British public, the married couple were sent to the diary room and assigned the task.
Big Brother told the duo to stage a walkout and convince the housemates that they were leaving the show with immediate effect.
If successful they will then re-enter the newly-refurbished luxury basement, where over the next 24 hours they will watch all of the action in the house on a giant plasma screen.
The pair will also get the opportunity to "prank" their housemates and set them a series of tasks.
Upon hearing the news the pair whooped and danced with joy, chanting: "God Save the Queen," with Spencer adding: "I love the British public!"
Spencer recently revealed that he and Heidi had "debated" about having sex in the Big Brother house.
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