 Jack HawkinsDr. Nicholas | Dr. Nicholas |
 Donald PleasenceProf. R.C. Tremayne | Prof. R.C. Tremayne |
 Georgia BrownFay Patterson (segment "Mr. Tiger") | Fay Patterson (segment "Mr. Tiger") |
 Donald HoustonSam Patterson (segment "Mr. Tiger") | Sam Patterson (segment "Mr. Tiger") |
| RRussell LewisPaul (segment "Mr. Tiger") | Paul (segment "Mr. Tiger") |
 David WoodTutor (segment "Mr. Tiger") | Tutor (segment "Mr. Tiger") |
 Suzy KendallAnn / Beatrice (segment "Penny Farthing") | Ann / Beatrice (segment "Penny Farthing") |
 Peter McEneryTimothy Patrick (segment "Penny Farthing") | Timothy Patrick (segment "Penny Farthing") |
| NNeil Kennedy1st Removal Men (segment "Penny Farthing") | 1st Removal Men (segment "Penny Farthing") |
| RRichard Connaught2nd Removal Man (segment "Penny Farthing") | 2nd Removal Man (segment "Penny Farthing") |
 Beth MorrisPolly (segment "Penny Farthing") | Polly (segment "Penny Farthing") |
 Frank ForsythUncle Albert (segment "Penny Farthing") | Uncle Albert (segment "Penny Farthing") |
 Joan CollinsBella Thompson (segment "Mel") | Bella Thompson (segment "Mel") |
 Michael JaystonBrian (segment "Mel") | Brian (segment "Mel") |
 Kim NovakAuriol (segment "Luau") | Auriol (segment "Luau") |
 Michael PetrovitchKimo (segment "Luau") | Kimo (segment "Luau") |
 Mary TammGinny (segment "Luau") | Ginny (segment "Luau") |
 Lesley NunnerleyVera (segment "Luau") | Vera (segment "Luau") |
 Leon LissekKeoki (segment "Luau") | Keoki (segment "Luau") |
 Zohra SehgalMalia (segment "Luau") | Malia (segment "Luau") |
 Charles GrayNicholas (Clinic Link Episodes segment) (voice) (uncredited) | Nicholas (Clinic Link Episodes segment) (voice) (uncredited) |
