There's a Mirror On the Wall

Bridging Universes (10693 words) by Morgyn Leri, skipthedemon
Chapters: 1/1
Fandom: Doctor Who
Rating: Teen And Up Audiences
Warnings: Creator Chose Not To Use Archive Warnings
Characters: The Master | Koschei, Tenth Doctor, Romana II (Doctor Who), Toshiko Sato, Jack Harkness (from S1E12 of Torchwood), Harriet (Torchwood), Ms. Roberts (Original Character)
Additional Tags: Alternate Universe, Crossing Timelines, GFY
Series: Part 15 of Fairytales and Nightmares
Summary:

The Master finds himself translated from one universe to another, without anyone being quite sure how he got there. Least of all his alternate.