Admittedly, the many references to classic Who may have earned it an extra point with me. However, it's the insight into the companion's lives & inner struggles that truly makes it so compelling. The current series is quite daring compared to others; it's willing to branch out in different directions than the show has ever explored before. IMO, it's succeeding as of now, & I'm hopeful that the intricately-woven thread of the overall arc & the establishment of new canon details will come together for a solid landing in the end...
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