Doctor Who: The Newbies Guide
The Ark in Space
This is the second story in Season 12.
The Fourth Doctor dresses in a rather bohemian outfit, notable for its long scarf. Unlike his previous incarnation, he is not willing to base himself on Earth with UNIT.
Sarah Jane Smith is a journalist who, in The Time Warrior, sneaked into UNIT in search of a story and ended up accompanying the third Doctor on a trip to the middle ages. Sarah has subsequently become the Doctor's travelling companion.
Harry Sullivan is a naval Doctor working for UNIT. In Robot he was responsible for examining the newly regenerated Fourth Doctor. At the end of that story the Doctor offered Harry a trip in the TARDIS. Harry accepted, not knowing that the TARDIS is actually capable of time and space travel. Harry is something of an upper class gentleman.
Recurring and Historical Characters