Add aninvisible villain lurking in the shadowsand a recipe for thrilling success abounds.

This winding story takes enticing pieces of an abstract puzzle and slowly puts them together.

However, in typical Moffat fashion, there’s still enough time to save the day.

The 10 Best David Tennant ‘Doctor Who’ Episodes, Ranked

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Bytaking sci-fi concepts and using them to tackle human stories and themes,Doctor Whohas never been more relatable.

Considering this was a budget-saving Season 2 episode, it is remarkablyone of the season’s most gorgeous.

Despite many people suggesting thatDoctor Whohas never been more political,this is the most partisan of any episode.

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“Turn Left” is the most underrated episode inTennant’s best season.

This episode is dedicated to horror.

The best of these is “The Waters of Mars”.

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After landing on Mars in 2059, The Doctor meets the first-ever human colony.

KEEP READING:The 10 Best Modern ‘Doctor Who’ Season Finales, Ranked

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10th Doctor and Sarah Jane with K9 in ‘School Reunion’ from ‘Doctor Who’

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David Tennant as the Tenth Doctor and Billie Piper as Rose looking up frightened in Doctor Who, “The Impossible Planet”

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River Song (Alex Kingston) talking to the Tenth Doctor (David Tennant) in the Doctor Who episode, Silence in the Library

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Two Doctors come face to face.

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The Family of Blood in Doctor Who series 3.

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Sophia Myles in ‘The Girl in the Fireplace

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Catherine Tate as Donna and Bernard Cribbins as Wilfried Mott in Doctor Who, “Turn Left”

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Doctor Who - Blink

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Lindsay Duncan as Adelaide Brooke and David Tennant as The Doctor in The Waters of Mars on Doctor Who

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David Tennant’s Doctor looks terrified in the Season 4 episode, Midnight

Image via  BBC

Doctor Who

David Tennant