Sasquatch (species)
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The Sasquatch were ape-like beings who evolved to manipulate their home planet by mere thought, becoming "masters and servants of a grand cosmic order" which permeated the multiverse.
They were very large, and communicated telepathically. All of their technology resembled trees, mountains or deep pools of water.
Biology and abilities
The Sasquatch were brown furry hominoids who resembled giant apes. They evolved telepathic abilities, which became their sole means of communication.
Since they had to obey the physical laws of any universe they visited, they were unable to communicate within the Doctor's universe. However, they retained incredible physical strength here. The Fifteenth Doctor understood that one Sasquatch was showing a considerable amount of restraint in handling him. (AUDIO: Sting of the Sasquatch [+]Loading...["Sting of the Sasquatch (audio story)"])
Technology
The Sasquatch used arboportation to travel instantly between universes, using trees to teleport across the Void, using a biphasic organic power source.
They grew wooden starships from seedlings, and learned the properties of multi-dimensional crystalline structures, leading to many advances.
One group of Sasquatch were based on the Evergreen Dream, an inter-universal spaceship which the Doctor described as "a sort of Void Ship", where they had medical technology capable of healing other creatures, like humans, with organic and psionic energy, in part using crystals to remove the sleeker infestation. (AUDIO: Sting of the Sasquatch [+]Loading...["Sting of the Sasquatch (audio story)"])
History
Evolution into higher beings
The Sasquatch were apparently so attuned to their homeworld that they evolved to be able to manipulate their local surroundings. Over time, they developed a complex understanding of the natural sciences, which they coupled with a deep exploration into the technological potential in psionic energy, which could be channelled through crystals.
Being "one with nature", they kept hold of their most important philosophies as they developed in knowledge and power, and managed to avoid some of the pitfalls experienced by other higher species. Eventually, they reached a point where they could transcend their physical bodies entirely, and communicate telepathically even with members of other species.
Travelling the stars and beyond
Their "proudest achievement" was then the development of arboportation, which allowed them to travel across the Void into other universes in mere moments. However, this development created a particular supply problem: the power source required came from sleekers, who were rare threadworms, found on a planet at the edge of their galaxy.
The sleekers were unique creatures, capable of "connecting with each other" to the point that they could merge into one massive organism, or split apart into trillions, according to need. They were also a source of an organic energy pulse, which was unique to them.
The Sasquatch harvested them, and allowed the creatures to propagate through their arboportation network. Since they had already developed intergalactic travel, with their seed-grown inter-dimensional crafts, they now began to traverse the multiverse, inadvertently spreading these worms far and wide, onto countless worlds, and across countless realms.
Unbeknownst to them, the "strands" of sleekers that would travel with them were becoming "vampiric" in response to these unknown and often hostile environments. They began to infect indigenous lifeforms, controlling their bodies and absorbing their intelligence, making them abnormally aggressive. Ultimately, they would not need to keep their hosts alive.
Soon enough, whole worlds were wiped clean of all indigenous life, as a result of the sleeker contagion. However, the Sasquatch themselves were immune. Horrified, they began to work on halting this spread by following and treating new cases.
Encounter with the Doctor
One group of Sasquatch, navigating between universes aboard the Evergreen Dream, had a great feeling of regret over these unintended consequences. After accidentally infecting Earth in the Doctor's universe, they took to carrying humans away by arboportation, in order to cure them of the sleeker contagion, before returning them to their proper place.
On one occasion, Kilbo removed Ruby Sunday, to be treated, and the Fifteenth Doctor managed to hitch a ride with them, via arboportation, onto the Evergreen Dream. There, Helk recognised him as a Time Lord, a member of "a great civilisation", and asked for his assistance. (AUDIO: Sting of the Sasquatch [+]Loading...["Sting of the Sasquatch (audio story)"])
