On his way to Vienna, veterinarian Klaus Wolf meets Biggi, a hitchhiker. Klaus is supposed to examine rhinos in Vienna, but with a monkey addicted to alcohol and other animal problems, Klaus has enough on his plate. He finds it rather inappropriate that he now also has Biggi on his hands. But he soon discovers a new, shy soul who is not as unsuitable as he initially thought.
| Actor | Role |
|---|---|
 Gerhart LippertDr.Klaus Wolf | Dr.Klaus Wolf |
 Mascha GonskaBiggi Hansen | Biggi Hansen |
 Gunther PhilippProf. Dr. Felix Grimm | Prof. Dr. Felix Grimm |
 Lotte LedlKarin | Karin |
| PPaul LöwingerTierpfleger Kranzl | Tierpfleger Kranzl |
 Beppo BremTierpfleger Engelbert | Tierpfleger Engelbert |
 Heinz ReinckeBauunternehmer Hansen | Bauunternehmer Hansen |
 Teri TordaiRuth | Ruth |
 Eva Maria MeinekeMrs Finch | Mrs Finch |
 Fritz MuliarPolizist Smekal | Polizist Smekal |
| CCarlo BöhmNot listed | Not listed |
 Michael HolmHimself | Himself |
| KKarl KrittlPostbeamter | Postbeamter |