"People of Earth, you are ours by right of conquest. Hence forth and forever you belong to us, of Ktynga, known to you as Norby's Comet. You cannot fight us, nor defeat us, nor evade us. We are superior to you in every way. At irregular intervals, we shall return and claim as our due from 20-50 thousand of your inhabitants. We desire nothing else. But we insist upon the payment, and we shall take it. If you resist, we shall take more. On our next visit, we shall claim John Hanby, the president of the Federated Nations, Axel Gruno, master scientist of the world, Sin Lo Hoi, commander-in-chief of the International Army, Gustav Norby, of the Mount Wilson Observatory. These men must place themselves in the evening of August 27th, 2332, at the peak of Mount Wilson. If they are not there, we shall take 100 thousand lives instead of 20. Fthaggua, Lord of Ktynga."

RPG makers, stop stapling these guys to Derleth’s latecomer Cthuga and let them be a decliciously cheesy, terrifying threat all on their own.

Perhaps with PCs trying to prevent the opening of a portal which will be a vanguard?

I can see the cheesy special effects of the hypothetical movie in my mind.

Since they’re too fast to be seen, they are barely on screen except when they leap between victims as lightning flashes.

Possessing a human rarely rather than feeding on them, with cheesy hokey