The W.O.R.M is a unit of robot that most likely utilized for mining purposes. It was used sparingly by humanity prior to the robot rebellion and seemed to be designed, as its name suggests, off of an earthworm.
At least one unit of W.O.R.M. did take part in the robot rebellion, serving under the influence of The Big Two, and performed several attacks against both humans and any robots resisting The Big Two. It was later encountered by a Guardian droid named Epoch, who served Princess Amelia in her private security force. After a brief skirmish with the droid, the W.O.R.M. was destroyed by Epoch who continued on its mission to find the Princess.