Face Hugger

http://static.tvtropes.org/pmwiki/pub/images/alien_facehugger_9231.jpg
Give us a kiss!
Simple. It attaches itself to someone's face.

Usually Nightmare Fuel from some horror film.

May be related to Face Full of Alien Wing-Wong. See also Orifice Invasion, Personal Space Invader.

Examples:

Comics
  • The mind-control starfish of Starro the Conqueror.

Film

Live-Action TV
  • The dreamcrabs in the Doctor Who episode "Last Christmas" attach themselves to their victims' faces and slowly eat their brains, while trapping them in dreams. One of the crew even lampshades the situation as being right out of Alien.
    The Doctor: There's a horror movie called Alien? That's really offensive. No wonder everyone keeps invading you.
  • The giant spiders contained in the Box of Gavrok in Buffy the Vampire Slayer attach themselves to people's faces before killing them.

Tabletop Games

Toys

Video Games
  • Gligar and Gliscor from Pokémon.
  • Metroids
  • Headcrabs from the Half-Life saga.
  • Brainsuckers from X-COM: Apocalypse, which are used as ammunition by certain aliens in addition to appearing on their own. Replacing a person's brain is their entire purpose; They don't even have a digestive system.
  • The Protozoid Slimers from Duke Nukem 3D.
  • Psi-Ops: The Mindgate Conspiracy: The Aura Beasts come of nowhere and wrap around Nick's face. Oh, and the only way to see them coming is using the psi draining Aura Vision.

Web Comics
http://tvtropes.org/pmwiki/pmwiki.php/Main/FaceHugger