Robert Zierath

Robert' or "Bobby" Zierath was briefly a companion of the First Doctor. He traveled with Vicki and Steven Taylor.

Biography
Bobby met the Doctor at the age of eight after being woken one night by strange noises in his closet. He opened it to discover that the TARDIS had materialised inside. He joined the Doctor for a series of adventure. They visited a planet with giant talking mushrooms (nicknamed "mooshroos by Vicki) and ancient Rome, fought robots that looked like drills, rescued Vicki from the 'Most High' and met Conidrons and the Zaksi. He was returned to his home moments after he had left (by repeatedly pressing the Fast Return Switch) and left the TARDIS with HiFi, given to him by Steven.

Following these events he told stories of his adventures at school, which led to him being mocked by his peers. His teachers grew worried about these stories. They contacted the Child Protective Services. They decided Bobby should be separated from his widowed father and placed in a foster home. He had to endure years of meetings with child psychotherapists, until he decided to pretend he had made it all up for attention.

About ten years later, Robert once more met the Doctor (who had not yet met Robert in his timeline) and accused him and his companions of ruining his life. This forced the Doctor to uphold the Web of Time and go back to take him on as a companion in the first place. (ST: The Schoolboy's Story)

Bobby was later remembered by the Doctor, who fondly recalled him as a "brave, brave boy". (ST: The Three Paths)