Metamorphosis technique

The Metamorphosis Technique was a form of Rutan technology designed to enable the amorphous Rutans to mimic specific individuals to try to enable them to win the their war with the Sontarans (Named DWF: Blind Terror)

Behind the Scenes
A Rutan assuming the shape of another person first appeared in Horror of Fang Rock. This plot element has appeared in virtually every subsequent story featuring the Rutans.