While on vacation with their bickering parents, young Eva and her little brother Johnny find in a polluted lake two strange friendly sentient octopuses made of strange material that attracts electricity. They take them as pets.
| Actor | Role |
|---|---|
 Dagmar Havlová VeškrnováAndrea | Andrea |
 Pavel ZedníčekHonza | Honza |
 Žaneta FuchsováEva | Eva |
 Milan ŠimáčekHonzík, syn Holanových | Honzík, syn Holanových |
| PPřemysl KočíMefisto | Mefisto |
 Miroslav MacháčekGeorge | George |
 Jan Kanyzaasistent Pierre | asistent Pierre |
 Boris RösnerAndreadis | Andreadis |
 Kateřina LojdováEliška | Eliška |
| MMarkéta MuchováKarin | Karin |
 Jaroslav MoučkaNekvasil | Nekvasil |
| BBožena FixováNekvasilová | Nekvasilová |
 Nina DivíškováVeselá | Veselá |
| MMilan MachVeselý | Veselý |
 Ondřej HavelkaBóďa | Bóďa |
 Jaroslava KretschmerováJiřina | Jiřina |
 Vladimír KratinaMertlík | Mertlík |
 Josef Bláhaporučík | poručík |
 Oldřich Kaiserseržant | seržant |
 Jiří KodetRudla Fára | Rudla Fára |
 Otto ŠimánekNot listed | Not listed |
 Jitka AsterováNot listed | Not listed |
| JJan StrupekNot listed | Not listed |
 Vlastimil Brodskýděda Holan | děda Holan |
 Oldřich VlachNot listed | Not listed |
 Eugen JegorovNot listed | Not listed |
| JJaroslav VavřinaAccordionist | Accordionist |
| PPavel MyslíkNot listed | Not listed |
| JJiří VojtaCamera Operator | Camera Operator |
 Ján KramárNot listed | Not listed |