Lists by GusF
Of these 82 series, only 18 have 100 or more episodes and only three of those ("Stargate SG-1", "Law & Order" and "Smallville") have 200 or more episodes, which shows that I do have something resembling a life!
Tom Baker (possibly!), Peter Davison, Paul McGann, the late Elisabeth Sladen and John Leeson are the only actors to play the same character in both series.
Rumour has it that Peter Capaldi was considered for the Eighth Doctor in the 1996 TV Movie and he was definitely considered for the Eleventh Doctor while David Tennant was considered for the Ninth Doctor but I'm not including either of them since they both eventually became the Doctor.
Some would have been great, some would have been bad and some would have been so bad, they would have been good.
I'm not including actors who were considered for the role but not cast until a later time. Roger Moore, Timothy Dalton and Pierce Brosnan all fall into that category.
Five of them were made during the 1960s and four of them feature time travel.
Steve McQueen, James Coburn, Charles Bronson, Whit Bissell and George Voskovec each appear in two of the films. The first three all appeared in "The Magnificent Seven" and "The Great Escape", Bissell appeared in both "The Magnificent Seven" and "The Time Machine" and Voskovec appeared in both "12 Angry Men" and "Somewhere in Time".
Richard Dean Anderson and Michael Shanks are the only actors to appear in the pilots of all three series.