Doctor Edward Marlow disappeared in 1850. His wife Georgina Marlow met the Eighth Doctor in 1851 at the Great Exhibition, when she was looking for her youngest son. She later had the Doctor released from prison, claiming him to be her missing husband.
In truth, Georgina was due to be made homeless, and wanted the Doctor to pose as her husband, since he looked and sounded exactly like Edward. This would help prevent her missing husband's uncle from reclaiming the house he had bequeathed to his nephew. The real Edward was reunited with Georgina after the Doctor's TARDIS had departed. (AUDIO: Other Lives)