Source: DVD 576p 3,000 kbit/s. At a top-secret UNIT facility Dr Sally Arnold is studying an alien artefact, a Nestene energy unit. It is unresponsive until, as a last resort, she feeds into it a cosmic signal from UNIT's most powerful deep space scanning satellite. This causes a violent release of energy that kills her assistant Janice. The energy unit has vanished, however it is not gone. The energy unit has made a replica of the warehouse's senior archivist Graham Winslet.