Doctor Who - Fourth Doctor Monsters!

Some random foes of the Fourth Doctor...

The society in and around Kaldor City was apparently almost wholly dependent on humanoid robots for servants and manual labour. The Sandminers, which made a major contribution to Kaldor's economy, were almost entirely crewed by robots of this type. Although superficially similar (all were designed to be aesthetically pleasing), the robots were constructed in varieties which differed in their intelligence, autonomy, and ability to communicate.

A 'Voc' from The Robots of Death.

The robots were physically stronger and more durable than most humans. It was generally assumed that fundamental protocols in the brains of the robots made it impossible for them to knowingly harm humans, although a robotics genius such as Taren Capel could override this precaution. The robots recognised their authorised controllers via their voice prints. A change in the controller's vocal pattern could result in apparently rebellious behaviour and non-compliance from a robot. All robots were identified by their class letter and a unique number, for example a Voc might be 'named' V7.

A 'Sandminer Voc' robot.  

DUM
The majority of the robots were D-class Dums, built without the ability to speak. On a sandminer the Dums mostly kept to the engineering decks, away from the human crew, making them appear less common than was the case. Dums wore dark green tunics. D84, a highly sophisticated Super-Voc class robot, was disguised as a Dum.
VOC
More able were the V-class Voc robots, who had the power of speech. In the absence of humans, Vocs performed essential control deck duties on a sandminer and were capable of running the vehicle without supervision. They could give back massages to human crew. They wore green tunics.
SUPER-VOC
Each sandminer's complement of robots included one SV-class Super-Voc, which had enhanced decision-making and organisational skills. The Super-Voc was effectively the leader of the robots, though still subservient to any of the authorised human crew. The Super-Voc wore a silver tunic.

Nimon. Horny?

The Nimon were large black-skinned humanoids with heads resembling the mythical minotaurs. Their horns could shoot out blasts of energy. Nimons drained energy directly from their victims, leaving them as husks. The Nimons had mighty, rumbling echoing voices. They were related to another minotaur-like species. (The God Complex)

The Nimons would feed on the population of an entire world, usually consuming it to extinction within a few years. As their food source got scarce, they would look for another planet ripe for conquest and draining.
Usually, one Nimon was sent to a planet, representing itself as a god with advanced technology. It would construct a maze-like Power Complex, a building-sized labyrinth of circuitry designed to generate a pocket black hole back to the Nimons' current planet. The Nimons would then migrate en masse to the new planet using capsules transmatted through the black hole. The Nimons would then drain that world dry and look for the next, continuing the cycle. They referred to this as the Great Journey of Life. The Nimons were very keen to conduct the Great Journey of Life to Earth, due to its prime position in the galaxy. From there, various alignments could offer millions of worlds for the Nimon migration to attack.

Experimental Prototype Robot K1 & the Doctor.

The Experimental Prototype Robot K1 was a robot designed and built by Professor J.P. Kettlewell of Think Tank. It was intended to replace humans in difficult and dangerous tasks, including mining and activities involving radioactive material.

K1 Robot - Big & Clever.

Weng-Chiang was the ancient Chinese god of abundance, having the power to make things grow. He was apparently an evil being, said to have breathed poisonous fumes from his mouth and kill men with light from his eyes. He was an ethnic corruption of Sung-Chiang, the god of thieves and criminals.

The Tong of the Black Scorpion was a fanatical cult convinced that he would return one day and and rule the world.

51st century time traveller Magnus Greel was believed to be Weng-Chiang by Li H'sen Chang when he found him, and thus Greel gained control over the cult. Descendents of the Tong soldiers who believed Greel to be Weng-Chiang were told stories of the god's anger.

Look out behind yoooouu! Magnus Greel / Weng Chiang.

Magnus Greel was the Minister of Justice for the Supreme Alliance of Eastern States in the 51st century. When the Alliance fell to the Filipino Army in the Battle of Reykjavik, he became a wanted war criminal. He escaped by using an experimental time cabinet. He went to the late 19th century China and then to London, where he continued his depraved activities on a smaller scale. This made him the first human to officially travel through time.

In Greel's time, the Earth was split into a number of warring alliances. The Icelandic Alliance and Greel's Supreme Alliance were at war. The Icelandic Alliance fell when Greel had the doll-like but homicidal cyborg known as the Peking Homunculus assassinate its commissioner Ingrid Bjarnsdottir, nearly precipitating World War VI.

He considered himself a driving force in the project in which his nation pioneered time travel. Apart from that he also personally experimented with the catalytic extraction chamber, an attempt to cannibalise life energies. One hundred thousand "enemies of the state" were massacred for these experiments.

As the Supreme Alliance's ironically named Minister of Justice, Greel carried out an atrocity earning him the title of the "Butcher of Brisbane". A human monster, Greel thought nothing of unprovoked murder and cannibalism.

After the defeat of the Supreme Alliance in the Battle of Reykjavik, Greel utilised a time cabinet to travel with the Peking Homunculus back in time to 19th century China. Using information provided by his fifth incarnation, the Doctor was able to prevent further bloodshed, bringing the brief Sixth World War to a close. 

Greel passed himself off as a god, Weng-Chiang, to Li H'sen Chang. With Chang posing as a conjurer and the Homunculus as a ventriloquist's dummy called Mr. Sin, they eventually found themselves in London.

The passage through time had caused great damage to Greel's DNA, deforming him. He wore a mask and concealing clothes to hide his true form. While Greel lived in fear of Time Agents, Chang abducted young women for Greel to use their life energy to restore himself - a method which was inherently flawed and only accelerated the damage.

Eventually he tried to restore his body using the time cabinet, but was instead shoved inside his own extraction chamber by the Fourth Doctor, resulting in fatal cellular collapse.

Zygons. Terrorising.

The Zygons were a race of metamorphic humanoids. They originated from the planet Zygor, but often tried to migrate away from it. They are solidly built humanoids with large, cone-shaped heads. Their heads, arms and torsos were covered in suckers, and they had deeply inset faces. Zygons had dark red blood and spoke in a gurgling whisper. They were stronger than humans and could live for centuries. They also had an earthy, iron odour and the ability to sting people with venomous barbs on their palms. These stings could stun, maim or kill. They left large welts on the affected area. Young Zygons were called hatchlings and were slimy and pale with shorter limbs. Hatchlings were mute, but much faster than adults.

Zygon technology was partly biological, with an organic look. This was exemplified by the Skarasen, a large, cybernetically enhanced creature from Zygor.  Zygons were also known to use the lactic fluid of the Skarasen as a source of food. Their use of organic ships was well known.

One of the most important Zygon discoveries was their body-print technology. The Zygons would capture a specimen, such as a human, and put them in a special receptacle. A Zygon could then take the form of this specimen, mimicking both voice and appearance. This body-print needed to be renewed every two hours, while the prisoners were kept alive but unconscious. Though they generally took the forms of humanoids, they could also mimic creatures of diverse sizes and shapes, such as dogs and cattle.
All figures are Harlequin / Black Tree Design.