And in making their surprise comeback, they dropped a nomination bombshell as they revealed that Charlotte Keys and Isabelle Warburton were up for the axe.
Tom and Hannah appeared on the living room TV screen to the shock of the housemates, before announcing their nomination decisions.
Charlotte and Isabelle face the chop in the last eviction of the series after being voted for in secret by Tom and Hannah who were fake evicted from the house on Friday night.
Other than an apparent mock shock face from Charlotte, there didn't appear to be much immediate reaction from either of the girls.
The one of the two who gets the most votes will be kicked out via the backdoor on Monday, with their exit shown in Tuesday's show.
Following the real eviction of Sam, Chanelle and Ellie in Friday night's live show, Big Brother called a face-to-face eviction where housemates were told they had to decide which two more housemates would leave via a back door eviction.
Unknown to the rest of the house, Tom and Hannah only moved next door and are living in secret in Big Brother's attic. They had the power to decide which two housemates faced the final eviction of the series.
To no surprise, Hannah wanted to keep her sister Deborah safe while Tom made Kieran safe.
Hannah put Charlotte up for eviction, saying: "She is going to be my option of nomination. The reason being is because I feel like she should have respected the fact of how it may feel nominating another person that is a pair when you've been in that situation."
Tom then nominated Isabelle for eviction, saying: "She's nominated me twice and evicted me, so yeah I'm going to nominate Isabelle."
Who do you want out in this week's Big Brother eviction? Vote in our website poll below...
Official voting lines are open now and close at 3PM.
The one with the most votes to evict will be booted out the backdoor on Monday night, with their exit shown in Tuesday night's episode.
Big Brother continues at 10PM on Monday night, when Hannah and Tom will return to the house.