Denizens of Yaddith

The Denizens of Yaddith are a race of brilliant scientists and powerful wizards whose planet was destroyed by Dholes. Having developed teleporting machines known as "light-wave envelopes", some denizens were able to escape Yaddith's destruction and can now be found in various places across the universe, including Earth and the Dreamlands.

In the RPG...

Denizens of Yaddith have human-ranged stats, and have even been known to disguise themselves as humans with the use of robes, mittens, hats, and masks. Hence, they could easily be put into any scenario if needed. Yaddithians uniqueness comes from the fact that they utilize their own technology, especially with regards to beam weaponry. Humans can figure out how to operate such weaponry with a Hard INT roll, assuming they've seen it in use beforehand.

    The 7e Malleus Monstrorum has changed the ranges of STR and SIZ, while also increasing INT and DEX.

In a video game...

As I mentioned above, a Yaddithian could be slotted in almost anywhere if they were disguised, which makes them quite flexible, and I imagine that if they were an ally, an eventual reveal of their true form would quite shocking to the player.

In a film...

It's been a while since I read it, but Through the Gates of the Silver Key would make for an interesting film, especially with the final twist.