Derek Calder

Derek Calder played several roles on Doctor Who, only one of which he was ever credited.

Credited roles

 * The Moonbase - Scientist

Uncredited roles

 * The Romans - Guard & Gladiator (DWM 251)
 * The Underwater Menace - Fish Person (DWM 209)
 * The War Games - Alien technician, British soldier and a Time Lord technician (DWM 232)