Spies from Andromeda (later known as "Sleepers") successfully infiltrated the Gallifreyan Matrix, choosing Earth as their base of operations. When they discovered the Andromedans' plan, the Time Lords struck back. The actions they took against Andromeda itself are unknown, but they moved Earth out of the Solar System and rechristened it Ravolox. The Ravolox Stratagem was eventually uncovered five hundred years later by the Sixth Doctor when he and Peri visited Ravolox (7A-7C). The Wirrn's breeding colonies destroyed by the Empire were located on Andromeda Gamma Epsilon (4C). Andromeda was famous for its bloodstones (5B). Sabalom Glitz's home planet, Salostopus, was located in Andromeda (7A). Castrovalva was supposed to be located in the Andromedan Phylox Series (5Z).