* DoesThisRemindYouOfAnything: The Venusian refugees living on Earth after fleeing from their home planet from genocidal Martians and facing hardships in living in alien-fearing England parallels to Syrian refugees fleeing from the Syrian Civil War and the threat of ISIL.
* NightmareFuel:
** The use of the working girls to feed the Martian by sucking out their blood, all to save its life in exchange for theirs.
** The opening scene of Ned Penny finding the remains of their corpses in the Thames.
** The discovery of the Martian hives of the reverse engineering of humans so that they could replace humans with Martians turned into them, allowing them to infiltrate the human bases.

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