Series: Doctor Who
Season 3, Episode 6
Previous: “Evolution of the Daleks”
Martha, Tish, and the Doctor track Lazarus down to a cathedral.
Source: The Doctor Who Locations Guide
Lazarus kills Lady Thaw in his office and then Martha and the Doctor investigate in here.
Lazarus holds a party and conducts his experiment that goes horribly wrong.
People flee the party and converge on the street outside.