Suggestions for Sci Fi themed Lurkers
Cyber ManiacEvil gets an upgrade

See also Cyberdemons, Cyberzombies and Cyberhounds of Tindalos
Handyman'You’ve got to listen to me! Elementary Chaos Theory tells us that all robots will eventually turn against their masters and run amok in an orgy of blood and kicking and the biting with the metal teeth and the hurting and shoving.'

Often minions of the Rampant AI (see below)
Alien Apex Predator'Can you see him yet, Brad?'

Not Mythos related so generally considered to be Someone Else's Problem by THRESHOLD teams
Rampant AI'Look at you hacker. A pathetic creature of meat and bone. Panting and sweating as you run through my corridors. How can you challenge a perfect, immortal machine?'

What happens when an AI runs out of sanity points.
Generally immobile but with a command ability that enables the sub-activation of several lurkers with the 'robot' trait when activated. Also tend to develop powerful spellcasting abilities as they race towards a twisted singularity.
Malfunctioning Nanoassembler Swarm Grey Goo

The gestalt intelligences that control nanoswarms have turned out to be as susceptible to the sanity blasting effects of the Mythos as more conventional AIs.
Once it has Got Religion a nanoswarm cultist can dissolve a THRESHOLD operative in a matter of seconds and transform a corporate research station in to a temple to the King in Yellow in hours. Faster as they become able to warp reality by thought alone.
(Once transformed in to a temple a colony configured to generate spin gravity will act as an enormous prayer wheel and draw the attention of extradimensional entities across vast distances of 12-d spacetime)