[Achilles]

The housemates don't know for certain whether he was evicted for real.
Big Brother should have put ALL housemates up for eviction this week and then have a public vote.
Then on Friday's live eviction, Marlon appears on big screen in diary room and is offered the chance to return to the house, but he must choose to evict one of the housemates and take Helen's free pass for himself in order to go back in.
Marlon is a not a genuine housemate at this point, but the house BELIEVE he is.
Steven would be the most likely to receive the most votes, so Marlon accepts the offer and chooses to evict Steven and takes Helen's free pass to the final.
The reality is that Steven was evicted by public and Helen still has her free pass, but the house think Marlon evicted Steven and took her free pass from her.
Then Marlon goes back into the house for x number of days, with the house believing he has a free pass to the final. In my opinion that would be much more entertaining and explosive. The best part about it is that Steven is very well liked in the house and they will not be impressed that Marlon is there in place of him. PLUS they think he has Helen's free pass and untouchable.