Tegan Jovanka is a fictional character in the long-running British science fiction television series "Doctor Who". She was played by Janet Fielding. Tegan Jovanka was an Australian airline stewardess who was a companion of the Fourth and Fifth Doctors, she was a regular in the programme from 1981 to 1984. Tegan was the longest-serving companion in terms of years on the series (3 years, 1 month), although Jamie McCrimmon was in the most episodes and stories.