The Doctor and his companion Evelyn investigate a series of mysterious disappearances on the planet Chronos and once again encounter the dangerous Cybermen.
| Actor | Role |
|---|---|
 Colin BakerThe Doctor | The Doctor |
 Maggie StablesEvelyn Smythe | Evelyn Smythe |
| CChristopher ScottAdministrator Isherwood | Administrator Isherwood |
 Yee Jee TsoDoctor Reece Goddard | Doctor Reece Goddard |
| JJane GoddardNicola Savage | Nicola Savage |
 Nicholas BriggsCyber-Controller / Professor Osborn | Cyber-Controller / Professor Osborn |
 Richard HerringTaylor Renchard | Taylor Renchard |
 Stewart LeeRyan Carey | Ryan Carey |
 Alistair LockHoyer | Hoyer |
| AAndrew HairFantham | Fantham |
| WWilliam JohnstonKreuger | Kreuger |