Change of appearance

Animated scarecrow instigate the Second Doctor's change of appearance. (COMIC: The Night Walkers)

"Change of appearance" was, by some early accounts, the term used to describe the Time Lord process of changing bodies. (TV: The War Games, etc.)

History

Upon coming into contact with the Second Doctor, the War Chief observed that he had changed his appearance. In the Doctor's trial, the First Time Lord referred to the First Doctor's renewal as a change of appearance, and sentenced the Second Doctor to undergo the process once more. The Time Lords had the ability to let the Doctor choose the appearance he'd change into. (TV: The War Games) The animated scarecrows who initiated the Second Doctor's transformation also called it a change of appearance. (COMIC: The Night Walkers)

Following the trial and transformation, the Third Doctor recovered from his "total change of appearance". (PROSE: Lourdwater Cottage Hospital case summary) Alistair Gordon Lethbridge-Stewart also mentally referred to the transformation as a change of appearance. (PROSE: Doctor Who and the Auton Invasion)

When remembering the trial, the President of the Time Lords recalled that the Doctor had been sentenced to a change of appearance. (PROSE: The Three Doctors) During the First Omega Crisis, Lethbridge-Stewart initially believed that the Third Doctor had changed his appearance back into the Second Doctor when he appeared before learning that he had come from the past. (TV: The Three Doctors)

When observing the Third Doctor's regeneration, Lethbridge-Stewart was reminded of the Second Doctor's change of appearance, and used similar language for the Third Doctor's change. (PROSE: Doctor Who and the Giant Robot) Sarah Jane Smith later remembered knowing the Doctor both before and after his "change of appearance". (PROSE: Doctor Who and the Pyramids of Mars)