- Underworld – the enemy here is a unique one, a computer that has built its own robots.
- The Invasion of Time – other than the Sontarans, this features the Vardans, who have powers of telepathy and teleportation and can turn insubstantial but otherwise basically appear human.
- The Ribos Operation – The only ‘monster’ here is the Shrivenzale, a local predator. From what we can tell, there is little to suggest that its game statistics would be radically different from, say, a tiger.
- The Pirate Planet – This story does not feature a monster.
This brings us to The Stones of Blood. This features three different types of alien. Apart from their physical appearance, the only significant difference between Diplosians and humans is that the former are essentially immortal. The Megara are microcellular machines, more of a game effect than a ‘monster’ in the RPG sense.
That leaves us with the titular monsters of the story, the Ogri. Although they have since been mentioned in passing, the Ogri are a one-off monster on the TV show. They have made brief appearances in the spin-off novels, although not so far in the audios… at least partly, one assumes, because they are silent.