Trivia / Doctor Who S7 E4 "Inferno"

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• Acting for Two:
  • Almost every actor in the cast plays two characters — one character in the normal world, and their parallel world counterpart. The only major exceptions are Jon Pertwee himself, since there is no Doctor in the parallel world (although he does play a radio announcer), and Christopher Benjamin, who plays Sir Keith Gold in the normal world, since his parallel world counterpart is already dead when the Doctor arrives there.
  • Stuntman Derek Ware didn’t perform his own stunt where his character, the mutated RSF Trooper Wyatt, fell to his death from the top of one of the chemical tanks. Instead, it was done by fellow stuntman Roy Scammell, who then preformed the then-highest fall ever done by a British stuntman, at fifty feet.
• Creator Couple: Director Douglas Camfield's wife Sheila Dunn plays Petra Williams.
• Creator's Favourite Episode: Both Nicholas Courtney and Caroline John named this as their favourite serial.
• Deleted Scene: There was a scene with the parallel universe characters listening to the radio that was cut. The radio newscaster was actually Jon Pertwee doing one of his "silly" voices. It was however kept for international regions to add some light comedy to the story and show Pertwee’s talents. The only colour copy that could be found had this scene included, resulting in it being used when it was first re-released.
• Fake Australian: Greg Sutton was played by the English Derek Newark.
• On-Set Injury: During the filming of one of the story’s chase scenes, stunt performer Alan Chuntz’s leg was run over. His leg was so horrifically injured he had to go to the hospital and upon learning of the injury, Pertwee himself fell ill for a few hours. He even gifted the actor a gift for an apology.
• Throw It In!: Originally, the script had a generic Sergeant character whose alternate counterpart becomes a Primord. But when Douglas Camfield cast John Levene in the part, he remembered that the latter had played the similar character of Corporal Benton in “The Invasion”, and chose to bring the character back.
• Troubled Production: Director Douglas Camfield had a heart attack during production, which left producer Barry Letts to do the in-house scenes he hadn't finished. Fortunately, Letts simply followed Camfield’s instructions.
• What Could Have Been: Kate O'Mara was considered for Petra Williams. She would later appear in the series a decade and a half later as the Rani.
  • Section Leader Shaw was supposed to interrogate the Doctor, before Executive Meddling made it so the Brigade Leader would do it instead, much to Caroline John’s annoyance.
• Working Title: The Mo-Hole Project, Operation: Mole-Bore, The Mole-Bore and Project Inferno.
• You Look Familiar:
  • Derek Newark (Greg Sutton) had previously played Za.
  • Sheila Dunn (Petra Williams) was Blossom Lefavre. Both serials were directed by her husband Douglas Camfield.

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