Bogleech.com's 2013 Horror Write-off:
" The Vleen "
Submitted by Jared ShingletonThe vleen is a small quilled creature that borrows into victimís brains and controlís their motions against their will. They reproduce by laying eggs in the personís blood stream. It is a wonderful creature for mind control. It can have many implications in military operations. That is, if someone can change the vleenís genetic code so it wonít borrow into the personís brain.
The creature reproduces by laying eggs in the blood stream of it's host. Once the eggs are old enough they form in pockets under the host's skin and burst forth new baby vleens. While in their larval stage they will borrow back into their, once living, home and feed on the nutrients in the marrow of the thing they came from.