Chrysalis

A chrysalis is a type of cocoon used by the zerg to infest terrans. Most experiments yielded poor results.

One "success" came in the form of Infested Kerrigan. She in turn used this method in projects infesting terrans. The process was usually a failure, but it proved to be successful with Ethan Stewart.

Game Unit
There are several known forms of chrysalises:
 * Young chrysalis, a drone-portable "power-up".
 * Mature chrysalis, treated as a structure.

StarCraft II
In StarCraft II: Wings of Liberty, Raynor's Raiders could collect genetic information from chrysalises with SCVs. This grants bonus damage to infantry.