The Fifth Doctor, Peri, and Erimem

This is an extended area that stretches the idea of Peri’s time with the Fifth Doctor past the point of reason, but helps solve the problem that Big Finish couldn’t do any stories with Tegan (at first), and Tegan was around for almost all of the Fifth Doctor’s time. Rather than leaning on Nyssa for all of the solution, they introduced a new companion, the Egyptian pharaoh Erimem. This stretch also features a short “Fifth Doctor alone” bit when he drops off Peri and Erimem during “The Veiled Leopard.” Aside from that interlude, release order and chronological order match for all the stories, even “The Gathering.”