The Overseer Series are a variety of items with the Overseer theme, which mainly focuses on the colors black and green as well as creepy-looking eyeballs. The Overseer are an army (much like Knights of Redcliff, Korblox's Empire, etc.) although there doesn't seem to be an official group from which the series is based on.

List of Overseer Accessories and Packages

List of Overseer Gears