Subway 37

Subway 37 was an area of Megropolis One. Mandrel threatened the Fourth Doctor into delivering a consumcard to the Consum Bank there. Cordo went with him to show him the way.

When he inserted the consumcard into the bank, it was detected as stolen property and the cubicle filled with balerium gas, knocking him unconscious. Cordo escaped prior to the arrival of a medical party that took the Doctor away, to the Correction Centre. (DW: The Sun Makers)