(in credits order)
- Graham Young(archive footage)
- Katherine D. Watson(as Dr. Katherine Watson)
- Gemma Birkett(as Dr. Gemma Birkett)
- Sohom Das(as Dr. Sohom Das)
- Inês Moreira(as Dr Inês Moreira)
- Jethro Batt(archive footage)
- Annie Biggs(archive footage)
- Fred Biggs(archive footage)
- Hawley Harvey Crippen(archive footage) (as Dr. Crippen)
- Bob Egle(archive footage)
- Geoffrey Foster(archive footage)
- John Hadland(archive footage)
- Adolf Hitler(archive footage)
- Winifred Jouvenant(archive footage)
- John Leonard(archive footage)
- William Palmer(archive footage)
- Diana Smart(archive footage)
- David Tilson(archive footage)
- Cristopher John Williams(archive footage) (as Chris Williams)
- Frederick Young(archive footage)
- Winifred Young(archive footage)
Rest of cast listed alphabetically
