Now, Jo is not a scientist or a librarian. She isn't even a secretary, but she is still hot. She becomes the Doctor's companion when Liz Shaw leaves UNIT. Her assignment, however, is purely due to the fact that her uncle is a high-ranking UNIT officer. She is young, naive and not very bright. This perplexes the Doctor, but he just hasn't got the heart to tell her and ask the Brigadier for a new companion. But as hapless as she may have been, Jo endured her fair share of adventures with the Doctor and proved to be quite the companion.
