Marcipor

Marcipor, also known as Marc, was a companion of the Fifth Doctor and previously a slave owned by Marcus Tullius Cicero.

Biography
In 63 BC, while serving drinks at a party hosted by his master Marcus Tullius Cicero, Marc met the Fifth Doctor, Tegan and Nyssa. He was transported to another realm alongside the Doctor, Tegan, Nyssa and Cicero. He used his navigation skills to help locate the three keys, and after this adventure Cicero decided to make him a freedman. During their adventure, he was invited aboard the TARDIS by Nyssa. (AUDIO: Tartarus)

Marc was given a bedroom, but found himself unable to relax in a large and comfortable bed and instead slept on the floor for his first night. (AUDIO: Interstitial)

The Doctor later returned to Cicero and would not tell him what had become of Marc, only saying that travelling with him was sometimes dangerous. Cicero asked if it was fatal, but the Doctor said nothing. (AUDIO: Tartarus)

Behind the scenes
Marc is portrayed by George Watkins, who is the nephew of Peter Davison.