Forth Generation

The Forth Generation was a faction of Cybermen created from workers who died constructing the bridge over the River Forth, who would accidentally be awoken over a century later by the Ninth Doctor. It was founded by Kreel, a Mondasian Cyberman who had become stranded in the area after his scouting party was split up by a rip in time. The damaged Kreel declared the Fourth Generation was his family and progeny. (AUDIO: Way of the Burryman, The Forth Generation)

Behind the scenes
An illustration featuring the Forth Generation Cybermen was featured in Doctor Who Magazine issue 575 for its review of the Old Friends set.