Jenny Ryan sent a warning to her colleagues on Beat the Chasers as she recognised a contestant.
Amy, a part-time maths teacher, came on the show hoping to win a huge amount of money.
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However, Jenny was quick to inform her fellow Chasers that they were 'in trouble'.
Shaun Wallace also recognised Amy as she walked on the set, saying: "Amy is a quizzing legend."
Amy revealed she had been on TV shows 15:1, Weakest Link, Only Connect and Eggheads.
With the odds in her favour, she faced five multiple-choice questions, with the chance to bank up to £5,000.
Amy was then given the option of playing between two and five Chasers for increasing amounts of money, but with a decreasing time advantage against them.
As the money goes up, so does the number of Chasers she must face.
Having secured £3000 in the multiple-choice round, Amy chose to face four Chasers for £50k.
However, with 10 seconds to go things soon went awry and Amy lost out on the big jackpot.
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Nevertheless Jenny admitted defeating Amy was a difficult challenge.
She said: "We are all very familiar with her face and reputation.
"We have come up against her in quiz leagues and Grand Prix."
