The Fifth Doctor, Tegan, and Turlough

This is an odd set of stories. Even though this TARDIS team lasted most of a season, there aren’t many stories with just Tegan and Turlough as companions. Big Finish released a trilogy focusing on Kamelion in 2019, set early in this season, and the rest of the stories are inserted around here because that’s where they happen to fit. The small trip at the end of “Frontios” is the only time Tegan traveled with the Doctor without anyone else, so some stories get wedged in there.