Evolution chamber

The zerg evolution chamber is the result of the Overmind's view that complacency is the road to defeat, causing it to spur zerg evolution constantly. The evolution chamber provides a testing ground for the genetic code of lesser breeds, helping to increase the offensive and defensive capabilities of the zerg ground-based breeds. It is also required in order for a creep colony to mutate into a spore colony.

StarCraft II
The evolution chamber is set to appear in StarCraft II.

Development
In May 2008 zerg units had been individually upgraded. This change was later reversed. The evolution chamber also reprises its role for general zerg upgrades in StarCraft II.