In the final episode of the four-part Channel 4 series, Lisa was sent home after she said in one of the final vetting processes that she would have sex for the job.
Fellow candidate Roopi was enlisted by the former intelligence officers to ask Lisa a series of questions, which included whether she would use her looks to gain the upper hand in a situation.
Roopi went on to ask her if she would go as far as to have sexual relations with someone and effectively cheat on her real-life partner. Lucy responded by saying: “I’d have to talk to him about it before.”
However, the three former intelligence officers listening in to the recruiting process raised it immediately as a “red flag”.
Ex-spy Deborah was heard saying: “By getting physically involved with someone you make yourself vulnerable.”
Afterwards, Lisa was called into the room and told that she had fallen at the last hurdle and was sent home from the process.
Lisa is not the first person to make a false move, previously one Spies trainee made an embarrassing train station blunder that cost them dearly.
The 15 trainees have been whittled down across the series and tonight there were just four left who faced the final challenge.
Lisa is axed from Spies on Channel 4
Lisa was told she had been eliminated on Spies
By getting physically involved with someone you make yourself vulnerable
Former spy Deborah
They were sent to Marrakech, Morocco, and thrown in the deep end as they were interrogated.
Out of the foursome, only Matt and Roopi made it through to the end after one person cracked under pressure while waiting in their hotel room for contact and another could not handle being questioned after being sleep-deprived.
The pair only found out that their last mission was over when they were led into the desert and left there.
One of the ex-intelligence officers tells her she's been eliminated
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Lisa missed out on the final round of Spies
It was only after waiting that the trio of former spies told them the code word “index” and they were congratulated for their successful completion of the process.
Spies follows on from the success of Hunted, another high octane Channel 4 series, in which candidates have to successfully go on the run from the authorities and avoid detection.
It is not yet known whether Spies has been recommissioned for a second series.