After Brian, a Representative of Pellent Glommeration called in to the Fifth Doctor's radio show to tell him what her species was like. (AUDIO: Echo Chamber)
The Doctor would eventually discover that the representative, along with many other people throughout history who looked like her, were caused by a group of Time War Daleks who — while on a mission to prevent the rise of Time Lord society on Gallifrey — created a time distortion which created alternate versions of themselves as four un-mutated Kaled people. This time distortion also caused there to be multiple copies of these four Kaleds at various points throughout time and space. (AUDIO: Effect and Cause)