Adelphi

A Time Lord told the Sixth Doctor about the many different versions of Peri Brown there were in the universe depending on the different high councils. She told him about the five versions, including the murdered Peri (TV: Mindwarp), the two that married Yrcanos (TV: The Ultimate Foe, AUDIO: The Widow's Assassin) and the one who had her memories wiped in the same manner that Jamie McCrimmon and Zoe Heriot had. (AUDIO: Peri and the Piscon Paradox)