On the jungle planet Spiridon, the Doctor, Jo and a Thal group find a slumbering army of Daleks ready to awaken.
| Actor | Role |
|---|---|
 Jon PertweeThe Doctor | The Doctor |
 Katy ManningJo Grant | Jo Grant |
 Bernard HorsfallTaron | Taron |
 Prentis HancockVaber | Vaber |
 Tim PreeceCodal | Codal |
| JJane HowRebec | Rebec |
| HHilary MinsterMarat | Marat |
 Alan TuckerLatep | Latep |
 Roy SkeltonDalek (voice) / Wester (voice) | Dalek (voice) / Wester (voice) |
 Michael WisherDalek (voice) | Dalek (voice) |