The delicious Lucy Saxon, played by Alexandra Moen, is somewhere between right and wrong. She tried to bump off her husband after she discovered he was The Master, making her the show's ultimate femme fatale.
But she isn't the only potentially heart-stopping vixen who has placed herself by the good doctor's side since the show began in the 60s.
Take a trip back in time and see all the gorgeous ladies that stood out next to the Time Lord...
22,000 people agreed to clean toilets for WiFi because they did not read the terms.
Tools designed to ensure computer code in smart cars does not crash has been inspired by hungry penguins.
The rounded sleeping capsules send guests drifting into ocean before arriving on desert island by morning.
Sitting on the saddle activates the part of the brain responsible for learning, a study has claimed.
Scientists are appealing for more people to donate their brains for research after they die.
Life on Earth may have arrived from Mars on an asteroid, scientists have claimed.
Lunar mission scheduled at the end of 2017 could find out if beer can be brewed on the moon.
A bottle used to teach children how far litter can travel ended up on Scottish beach after 8,700-mile journey.