Charlie Baker

 was the grandson of Gertie who at a young age was very interested in her stories about the Doctor, but as he grew up believed the stories were false.

In 26 September, 2016, the Twelfth Doctor arrived with Clara Oswald on a Time dragon and took Gertie and Charlie home. When the Doctor got his TARDIS back, the Doctor took them on a journey to Mars. (COMIC: Super Gran)