The Doctor and his companions must prevent the Cybermen from bombing the Earth in the 26th century. It is a battle not everyone will survive...
| Actor | Role |
|---|---|
 Peter DavisonThe Doctor | The Doctor |
 Matthew WaterhouseAdric | Adric |
 Janet FieldingTegan | Tegan |
 Sarah SuttonNyssa | Nyssa |
 James WarwickScott | Scott |
 Clare CliffordKyle | Kyle |
 Beryl ReidBriggs | Briggs |
| JJune BlandBerger | Berger |
| SSteve MorleyWalters | Walters |
| SSuzi ArdenSnyder | Snyder |
| AAnn HollowayMitchell | Mitchell |
| AAnne ClementsTrooper | Trooper |
 Mark StrakerTrooper | Trooper |
| AAlec SabinRingway | Ringway |
 Mark FletcherCrewmember | Crewmember |
| CChristopher WhittinghamCrewmember | Crewmember |
 David BanksCyber Leader | Cyber Leader |
| MMark HardyCyber Lieutenant | Cyber Lieutenant |
 William HartnellThe Doctor (1) (archive footage) | The Doctor (1) (archive footage) |
 Patrick TroughtonThe Doctor (2) (archive footage) | The Doctor (2) (archive footage) |
 Tom BakerThe Doctor (4) (archive footage) | The Doctor (4) (archive footage) |