The bank officer Bedrich Hroch is sent by the bank director to the zoo, which asked an allocation of one and half kg of gold for a gold tooth for a hippo. During the check up of the hippo's teeth Bedrich is swallowed by the hippo. The man does not die in the hippo's guts and he chats quite happily with his frightened wife Dása. Journalist Pip Karen, his friend is also present to the dialogue and he has immediately an idea how to use this special situation. He tells to the new minister Borovec and his opponent professor Fibinger that there is a hippo in the zoo which can speak. He also tells them how to use this situation for a political propaganda.
| Actor | Role |
|---|---|
 Oldo HlaváčekBedřich Hroch | Bedřich Hroch |
 Helga ČočkováDáša | Dáša |
 Svatopluk MatyášPip Karen | Pip Karen |
| HHelena BlehárováSoňa | Soňa |
 Miroslav Homolaministr Borovec | ministr Borovec |
 Zdena HadrbolcováPlašilová | Plašilová |
 Eduard Dubskýprof. Fibinger | prof. Fibinger |
 Jiří Lírošetřovatel | ošetřovatel |
 Slávka BudínováMajka | Majka |
 Josef Větrovecředitel zoo | ředitel zoo |
 Jiří HolýNot listed | Not listed |
 Oldřich VelenNot listed | Not listed |
 Jan SkopečekNot listed | Not listed |
| JJosef KobrNot listed | Not listed |
| MMiloš WilligNot listed | Not listed |
| TTomáš SedláčekNot listed | Not listed |
 Josef HlinomazNot listed | Not listed |
 Karel HáblNot listed | Not listed |
| IIvana BílkováBláža | Bláža |
 Jan PohanNot listed | Not listed |
| JJiří JelínekNot listed | Not listed |
| BBert SchneiderNot listed | Not listed |
 Vladimír HrubýNot listed | Not listed |
| KKarel HovorkaNot listed | Not listed |
| JJaroslav CmíralNot listed | Not listed |
| JJosef BádalNot listed | Not listed |
| MMilan MachNot listed | Not listed |
 Miloš VavruškaNot listed | Not listed |
 Jana SedlmajerováNot listed | Not listed |
| EEduard PavlíčekNot listed | Not listed |