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To me, this episode is the hidden gem in the (so far) disappointing series 10. Our TARDIS team travels to Scotland - where else - to settle a bet regarding the lost 9th Roman Legion. They quickly get caught up in the conflict between the young survivors and a new alien menace that feeds off of light.... apparently killing people? Whatever, this is Doctor Who.
Rona Murno is the first Doctor Who writer to write for both sections of the series - and what a hell of a job she does. Survival is another forgotten gem in the classic series, and I worry that this episode will be remembered the same way. Murno does an expert job at creating compelling characters and a tight plot, that isn't overblown with action - yet never feels tedious or stale. Everyone has the proverbial "job to do" and each piece does it magnificently.
If there is a weak spot - and there is - its the monster. The editors do a good job of not showing the monster too much (probably aware of how horrible the CGI is) and as a result, the action feels relatively suspenseful. However, the alien itself and its powerset is uninspired, and the audience never really feels genuine fear of the creature.
That being said, the positives far outweigh the negatives and I hope the fan base recognizes this and gives this episode the credit it deserves - in the hopes that Murno will return to write more for the new series. If this is what she can after a 20ish year break from Doctor Who, I am thoroughly interested to see where she goes from here.