Visible crew/equipment: In episode four, the Dalek chasing the heroes up the ventilator shaft is supported by strings.
Visible crew/equipment: After the Doctor recovers from his coma, he gets up and stands at the console. A reflection of a crew member can be seen in the shiny part of the central column.
Visible crew/equipment: As The Daleks plan to release bacteria into the atmosphere, a crew member is reflected in the glass box containing the bacteria.
Visible crew/equipment: At various points in the story, the pots for the plants of the Spiridon jungle are visible. Episode two has a couple of noticeable moments, when Codal is captured and when the Doctor is led away by The Daleks.
Visible crew/equipment: In episode five, when Taron knocks out the Spiridon, you can see a BBC camera in the foliage behind him.
Answer: In 'The Five Doctors', three separate Cyberleaders are definitely used. So it's likely that Cyberleaders are like unit commanders, of which a fair-sized army might have several.
Daria Sigma