X-ray vision

X-ray vision was the ability to see through physical objects.

The Grand Witch used magic to grant her x-ray vision, she later spied on the Second Doctor using it. (COMIC: The Witches)

Grant gained x-ray vision after swallowing the Hazandra. (TV: The Return of Doctor Mysterio)

The Doctor had always wanted X-ray vision and was disappointed when she did not receive the ability in her thirteenth incarnation. (PROSE: Things She Thought While Falling)