 Tom BakerThe Doctor | The Doctor |
 Elisabeth SladenSarah Jane Smith | Sarah Jane Smith |
 Philip MadocDoctor Solon | Doctor Solon |
| CColin FayCondo | Condo |
| MMichael SpiceMorbius (voice) | Morbius (voice) |
| SStuart FellMorbius Monster | Morbius Monster |
| CCynthia GrenvilleMaren | Maren |
| GGillian BrownOhica | Ohica |
| JJohn Scott MartinKriz | Kriz |
 Jon PertweeThe Doctor (3) (picture) (uncredited) | The Doctor (3) (picture) (uncredited) |
 Patrick TroughtonThe Doctor (2) (picture) (uncredited) | The Doctor (2) (picture) (uncredited) |
 William HartnellThe Doctor (1) (picture) (uncredited) | The Doctor (1) (picture) (uncredited) |
 George GallaccioMorbius Doctor (picture) (uncredited) | Morbius Doctor (picture) (uncredited) |
 Robert HolmesMorbius Doctor (picture) (uncredited) | Morbius Doctor (picture) (uncredited) |
 Graeme HarperMorbius Doctor (picture) (uncredited) | Morbius Doctor (picture) (uncredited) |
 Douglas CamfieldMorbius Doctor (picture) (uncredited) | Morbius Doctor (picture) (uncredited) |
 Philip HinchcliffeMorbius Doctor (picture) (uncredited) | Morbius Doctor (picture) (uncredited) |
 Robert Banks StewartMorbius Doctor (picture) (uncredited) | Morbius Doctor (picture) (uncredited) |
 Christopher BarryMorbius Doctor (picture) (uncredited) | Morbius Doctor (picture) (uncredited) |
| CChristopher BakerMorbius Doctor (picture) (uncredited) | Morbius Doctor (picture) (uncredited) |
