- You may be looking for the TV episode or the liquid.
Dark Water was a Doctor Who: The Twelfth Doctor comic story published in 2014.
Summary
The Cybermen have come up with a dastardly new invention.
Plot
In the style of a TV advertisement, a Cyberman talks about drinking dark water to take away its emotions. The Twelfth Doctor believes the invention is abominable.
Characters
References
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Notes
to be added
Original print details
to be added