Two young boys, play hooky from school in order to explore an ultramodern world's fair. They take in the many marvelous scientific and industrial exhibits, obtain literature, eat food, and generally run amok.
| Actor | Role |
|---|---|
| VVít WeingartnerHonza | Honza |
| MMilan ZemanVasek | Vasek |
 František FilipovskýSchool Principal | School Principal |
 Josef HlinomazPrison Guard | Prison Guard |
 Miloslav HolubCommissar | Commissar |
 Rudolf DeylGrandfather | Grandfather |
 Karel EffaNot listed | Not listed |
 Oldřich VelenNot listed | Not listed |
| JJana RendlováNot listed | Not listed |
| MMarkéta RauschgoldováNot listed | Not listed |
| ZZdenka RevayováNot listed | Not listed |
| EEva BaschNot listed | Not listed |
| ZZdeněk BlažekNot listed | Not listed |
| RRadim CvrčekNot listed | Not listed |
| AAleš KošnarNot listed | Not listed |
| FFrantišek ŠolcNot listed | Not listed |
| MMiloš VosmanskýNot listed | Not listed |
 Miroslav MoravecCzech Voice from the Loud-speaker (voice) | Czech Voice from the Loud-speaker (voice) |
 Jindřich NarentaGerman Voice from the Loud-speaker (voice) | German Voice from the Loud-speaker (voice) |