Barbara facing the "why travel through time and space if we can't change anything" dilemma is good enough on its own, but to make her the focus of the episode and show various traits of her character at the same time is just perfect. The sub-plots were so entertaining and endearing (the Doctor is such a gentleman it warms my heart. Ian remains iconic showing his skills. And Susan fighting for her rights to choose how to live and who to love?? She's my dearest) but Barbara carried the whole thing. Not a bad thing to say about this serial, tbh. Historicals are often my favorites and I'm glad they're also Barbara's time to shine because I adore her.