D&D Monsters: Oozes

We reach the final post in this series with the monsters that are, anatomically speaking, the simplest of them all. The idea of monstrous slime is essentially a modern one; some antecedents may exist here and there, but generally, we're thinking of the likes of the 1958 film The Blob or Clark Ashton Smith's formless spawn of Tsathoggua, which made their debut in 1931. 

The 1E Monster Manual includes a number of creatures that could loosely be described as oozes but only four of these have consistently appeared in the core rulebooks (excluding 4E, as I usually do, which retains just two of them in the MM1). Three of these are entirely amorphous, although the one that's perhaps the most notorious does at least have a shape.

DW Monsters: Sea Devils

Next up in season 9, we’re back to present-day Earth and The Sea Devils. The eponymous race are introduced as a variant form of the Silurians adapted to underwater life and, beyond the aquatic theme, provide a similar role in the TV show – although they do appear to be more inherently violent, presumably due to a warrior upbringing. They return much later in the classic run alongside the Silurians in Warriors of the Deep but were not seen again on screen until almost the end of the Thirteenth Doctor’s run. 

Outside of the TV series, they have proved less popular than their Silurian kin, appearing alongside the latter in the 1993 novel Blood Heat, but rarely featuring on their own outside of a few comics and short stories. They have appeared in just a couple of the audios, neither of which feature the Doctor and one of which is part of a larger Silurian plot arc. A mention in a novel that doesn’t feature them directly implies that they are the same as the Deep Ones created by H.P. Lovecraft - although beyond living underwater and being cold-blooded, there doesn’t seem to be much resemblance between the two.

D&D Monsters: Noncorporeal Undead

The concept of ghosts or other restless spirits is an ancient one, found, in some form or another in pretty much every human culture. The details vary considerably, and ghosts may not necessarily be malevolent, or even frightening but the basic idea is essentially universal. They're the sort of thing that just had to be included in D&D, albeit with the addition of generally making them more dangerous - and thus a meaningful threat - than they usually are in legend. There are several different types in the game, arguably a different sort of being from the corporeal undead, united by lacking a physical body and with various other means of inflicting harm. Four of these types are consistently present in the core rulebooks, although their details can vary significantly.

D&D Monsters: Succubi

The word "succubus" comes from Latin, referring to a type of demon that seduces men and slowly saps them of their vitality over a series of sexual encounters. This basic concept, however, long precedes even the Romans, with the general idea of  'evil demonic seductress' being fairly common across many cultures. It may, in part, be connected with the same sort of hypnogogic phenomenon that is responsible for the night hag myth - albeit interpreted in a more pleasurable manner. Indeed, succubi were not originally regarded as being attractive in their natural form - although, as with the D&D creature, they could shape-shift - the 'sexy' form only starting to become the standard in modern times.

DW Monsters: Peladon

The next story that we come to is The Curse of Peladon, which features no fewer than four different kinds of alien. Chief among them are the Ice Warriors, which I have already covered. Of the three new introductions, Arcturus’ abilities are more a product of the device he is using to move around, which must be customisable, so I’ll leave him out. That leaves Alpha Centauri and Aggedor.

Both reappear a couple of seasons later in The Monster of Peladon, and Alpha Centauri also has a cameo appearance (voiced by the same actress, no less) in the Twelfth Doctor story Empress of Mars. To date, Alpha Centauri has also appeared in five audios and one original novel, all set on Peladon, and the race has been referenced in a number of other novels. Aggedor is slightly less popular, appearing in two novels and one audio – although in their case, it’s different members of the same species rather than the same individual.

D&D Monsters: Mimics

The 1E Monster Manual includes several monsters that are essentially animate traps of one kind or another - floors that try to eat you, ceilings that try to eat you, stalactites that try to eat you, and so on. All of them with bland descriptive names rather than even an attempt at something atmospheric. The only one of these to remain consistently in the core rulebooks, however, is the mimic. Which is essentially a treasure chest that tries to eat you. It's certainly a contender for "silliest monster in D&D" (although it has some pretty stiff opposition) and it should come as no surprise that it's original to the game. Indeed, it's tailor-made for the "dungeon crawl" genre that D&D basically invented, since it makes even less sense in any other context than it does in that one.

So... yup, time for the mimic.

D&D Monsters: Shambling Mounds

The most obvious inspiration for the shambling mound is the DC horror character Swamp Thing, a plant-based monster popular enough to appear in a rather naff '80s film and a far superior '20s television mini-series. Swamp Thing first appeared in 1971, well before the shambling mound's debut in 0E, so the timing works, although that doesn't necessarily mean it isn't a coincidence. Notably, for instance, the shambling mound is literally a mass of vegetation, which is a fair description of Swamp Thing... but only following the characters' reinvention by Alan Moore, five years after the Monster Manual. Since there isn't much further resemblance between the two, it seems likely that the shambling mound is an original creation, with no apparent antecedents in myth or legend.