Petrification

Petrification was the process in which organic matter was turned into stone.

The hand of Eldrad was petrified but still wore a ring that allowed the minds of others to be controlled. When the hand was placed in the nuclear reactor at the Nunton Experimental Complex, Eldrad gained a whole new body. (DW: The Hand of Fear)

Angry at how life on Earth had changed, Light turned Lady Pritchard and her daughter Gwendoline to stone. (DW: Ghost Light)