Metamorphosis technique

The Metamorphosis Technique was a form of Rutan technology designed to enable the amorphous Rutans to mimic the shape of specific individuals and impersonate them as a tactic for winning their war with the Sontarans. (DWF: Blind Terror)

The Technique was first developed at the start of the 20th century. The Rutan Scout the Fourth Doctor faced on Fang Rock was highly trained in the new technique, impersonating key members of the lighthouse staff. (DW: Horror of Fang Rock)


 * It is described as a "technique", so the true power behind it, whether it be technology or genetic engineering or evolution, is unknown.

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.