In a parallel universe, Amy Bannister was Martin Bannister's second wife. They had a son together, Philip.
When Bannister was in a nursing home, he began to confuse fantasy and reality. He started to believe he was Doctor Who, the character he had written a television pilot about decades previously. In the fantasy, he travelled in his TARDIS with his granddaughter Susan (based on Amy), Ian (based on Philip) and Barbara (based on his nurse at the home). He eventually succumbed completely to the fantasy. (AUDIO: Deadline)