That's some input! Especially about the Cthulu Mythos
A useful thing about the Cthulhu mythos is its flexible membership. You can easily add many villains from other sources to its ranks.
Rowley's Vang Omniform would work quite well as one of its lesser menaces. They're a intelligent superparasite, with tentacles, and polyps. Their original empire was destroyed when their enemies blew up all their home stars, but the Vang survived, though forced into deep hibernation until prey should come within reach. (In one scene, cybernetic soldiers are exploring the wrong derelict when vines come out of the ceiling, yank them off their feet, and burn through their armour to devour their living brains.) They will disguise themselves as human when necessary, but when that phase is past they warp their hosts into horrendous shapes, growing new organ, many of them unpleasantly visible.
The Fendahl, from Doctor Who, would be a mid level menace. What the Doctor fought was a crippled ghost, a fossilised memory stirred to unlife after 12 million years, yet it could have devoured all life on the Earth within a year, and the sight of it killed.
The Fendahl-eater, product of one of the Time Lords' more ill-advised weapons projects, would rank near the elder gods themselves. It was not made from matter or energy, which the Fendahl could have devoured; it was a form of malefic space which, once released from its prison, could have devoured all space and time, from here to the furthest star, from the big bang to the last trump, all in a subjective hour. Afterwards, nothing would ever have existed, or ever exist, except an all-devouring void.
And there are more where they came from, many more. With the Cthulhu mythos, you can pick from among the horrors conjured up by a century of SF writers, and they have no lack of imagination.
Pitting Kirk against all the armies of nightmare might be overkill, and depicting a convincing yet meaningful win would be challenging, but a dozen mythos-compatable villain races, some only appearing off-stage, could be quite effective
A useful thing about the Cthulhu mythos is its flexible membership. You can easily add many villains from other sources to its ranks.
Rowley's Vang Omniform would work quite well as one of its lesser menaces. They're a intelligent superparasite, with tentacles, and polyps. Their original empire was destroyed when their enemies blew up all their home stars, but the Vang survived, though forced into deep hibernation until prey should come within reach. (In one scene, cybernetic soldiers are exploring the wrong derelict when vines come out of the ceiling, yank them off their feet, and burn through their armour to devour their living brains.) They will disguise themselves as human when necessary, but when that phase is past they warp their hosts into horrendous shapes, growing new organ, many of them unpleasantly visible.
The Fendahl, from Doctor Who, would be a mid level menace. What the Doctor fought was a crippled ghost, a fossilised memory stirred to unlife after 12 million years, yet it could have devoured all life on the Earth within a year, and the sight of it killed.
The Fendahl-eater, product of one of the Time Lords' more ill-advised weapons projects, would rank near the elder gods themselves. It was not made from matter or energy, which the Fendahl could have devoured; it was a form of malefic space which, once released from its prison, could have devoured all space and time, from here to the furthest star, from the big bang to the last trump, all in a subjective hour. Afterwards, nothing would ever have existed, or ever exist, except an all-devouring void.
And there are more where they came from, many more. With the Cthulhu mythos, you can pick from among the horrors conjured up by a century of SF writers, and they have no lack of imagination.
Pitting Kirk against all the armies of nightmare might be overkill, and depicting a convincing yet meaningful win would be challenging, but a dozen mythos-compatable villain races, some only appearing off-stage, could be quite effective