Trivia: It is mentioned that, The Doctor, like all Time Lords, can 'regenerate' himself a maximum of twelve times. After that, "it really is the end". Since the series started in 1963, nine actors have played the role of Doctor Who: William Hartnell (1963-66), Patrick Troughton (1966-69), Jon Pertwee (1970-74), Tom Baker (1974-81), Peter Davidson (1982-84), Colin Baker (1984-86), Sylvester McCoy (1987-89)(*although, according to the BBC, it was 1987-96, due to McCoy reprising his role for the 1996 TV Movie), Paul McGann (1996:TV Movie only) ...and the ninth Doctor Who will be Christopher Eccleston, who stars in a new series, planned for broadcast in 2005.
Trivia: At the end of episode 3 of "The Deadly Assassin", the Doctor is attacked and has his head held underwater for a very long time. The "cliffhanger" ending of episode 3 is a freeze frame shot of the Doctor (Tom Baker) under the water, apparently drowned. This ending elicited much criticism from Mary Whitehouse and the vocal National Viewers and Listeners Association, who lobbied to have Doctor Who taken off the air, or at least moved to a post-9pm "watershed" slot. In an interview in 1994, Whitehouse said that the ending of this episode still disturbed her, more than 14 years later.
Trivia: "The Deadly Assassin" is the only Doctor Who story in the classic series in which the Doctor does not have a "companion" of some kind. The previous companion, Sarah Jane Smith (played by Elizabeth Sladen) was written out in the previous story "The Hand of Fear", and the next companion, Leela (Louise Jameson) did not come on board the TARDIS until the next story, "The Face of Evil."
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