The Greatest Show in the Galaxy - S25-E4
Trivia: For a show with a "Circus and Clowns" theme, it is appropriate that this Doctor Who story was filmed in a tent. It wasn't planned that way, but the studio at BBC TV Centre in London that was originally to be used for filming "The Greatest Show in the Galaxy" had to be closed at short notice when the presence of dangerous white asbestos was discovered in the studio's structure. With no alternative studios available, filming was switched to a marquee temporarily erected in the car park of the BBC Studios at Elstree.
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