Yvonne Hartley was a Mondasian who lived on Mondas. She lived with her dad and her brother and worked at the hydroponics centre, which contained the only living plants on Mondas. She suffered from a chronic cough. When Sisterman Constant came, she recommended that Yvonne be called up.
She was taken to be converted into a Cyberman, but the power failed during processing. She escaped the factory and returned home. She died with her family. (AUDIO: Spare Parts)