The Second Doctor has been partially regenerated by the Time Lords as punishment for breaking the non-interference policy, but the process is stopped halfway, leaving the Doctor an amalgam of his second and as-of-yet future incarnation...
| Actor | Role |
|---|---|
| TTony GarnerSecond-and-a-Half Doctor | Second-and-a-Half Doctor |
 Patrick TroughtonSecond Doctor (archive footage) | Second Doctor (archive footage) |
 Jon PertweeThird Doctor | Third Doctor |
 Peter TuddenhamVoix | Voix |
 Hugh LloydScribe | Scribe |
| DDavid ClarkeAuriga | Auriga |
| AAnthony TownsendCallisto | Callisto |
| LLynette EastAdreinna | Adreinna |
| SStephen CranfordThe Covellitor | The Covellitor |