He isn't a simple Time Lord. He's connected to the Dark Time. It's The Doctor.
Doctor Who ?
He's not A Doctor ! He is THE Doctor! The original we might say!

Important note: That's my own interpretation !

Cast:
-Fugitive: Jo MARTIN
-Morbius 1: Christopher Barry
-Morbius 2: Robert Banks Stewart
-Morbius 3: Christopher Baker
-Morbius 4: Philipe Hinchcliffe
-Morbius 5: Douglas Campfield
-Morbius 6: Graeme Harper
-Morbius 7: Robert Holmes
-Morbius 8: George Gallaciao
-First: William Hartnell - Recast by: Richard Hurndall, David Bradley - Voiced by: David Bradley, Stephen Noonan
-Second: Patrick Troughton - Recast by: Reece Shearsmith - Voiced by: Michael Troughton
-Third: Jon Pertwee - Voiced by Tim Treloar
-Fourth: Tom Baker
-Fifth: Peter Davison
-Sixth: Colin Baker
-Seventh: Sylvester McCoy
-Eighth: Paul McGann