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  • No first name is given in the scripts and episodes, although E C Tubb named him "Gerald" in his novelisation.
  • He was scripted to appear in Dragon's Domain, but Roy Dotrice was not available to film the role in January 1975, so the lines were assigned to Commissioner Dixon, a predecessor.


  1. The Catacombs Character Guide entry for Simmonds lists his approximate age as 52 years. (Age based on the age of the actor in 1975)