The Sultan of Zanzibar has a harbor infested with sharks, which makes it impossible for ships to trade with him. In an attempt to fix the problem, he brings twelve hippos into the harbor to keep the sharks away. His idea works well enough, but once the hippos are no longer a novelty and the people no longer feed them, they begin to starve. After the hungry hippos rampage through the city looking for food, Aban-Khan, the king's adviser, slaughters all the hippos except one, a little hippo named Hugo.
| Directing | Bill Feigenbaum | Director |
| Sound | Bert Keyes | Music |
| Writing | Bill Feigenbaum | Story Developer |
| Writing | Thomas Baum | Screenplay |
| Production | George Barrie | Executive Producer |
| Production | Robert Halmi Sr. | Producer |
| Production | Roger Moore | Executive Producer |
| Crew | Zoltán Bacsó | Cinematography |
| Crew | Attila Csepela | Cinematography |
| Crew | István Harsági | Cinematography |
| Crew | Irén Henrik | Cinematography |
| Crew | András Klausz | Cinematography |
| Editing | Sid Cooper | Editor |
| Editing | Magda Hap | Editor |
| Editing | Mária Kern | Editor |
| Art | Graham Percy | Production Design |
| Production | Román Kunz | Production Runner |
| Production | Karola Ács | Production Manager |
| Sound | Endre Bérczi | Sound |
| Sound | Les Fresholtz | Sound |
| Sound | Arthur Piantadosi | Sound |
| Sound | Ad Roest | Sound Re-Recording Mixer |
| Sound | Richard Tyler | Sound |
| Visual Effects | Zsuzsa Agócs | Animation |
| Visual Effects | Károlyné Bakai | Animation |
| Visual Effects | Tibor Belay | Animation |
| Visual Effects | Katalin Bánki | Animation |
| Visual Effects | Zsuzsa Bárány | Animation |
| Visual Effects | Sándor Békési | Animation |
| Visual Effects | Tamásné Cser | Animation |
| Visual Effects | Gáborné Danyi | Animation |
| Visual Effects | Gáborné Dr. Székely | Animation |
| Visual Effects | Ferenc Dékány | Animation |
| Visual Effects | Steve Fellner | Animation |
| Visual Effects | Katalin Fonyódi | Animation |
| Visual Effects | Gizella Gregán | Animation |
| Visual Effects | Ildikó Gyarmathy | Animation |
| Visual Effects | József Gémes | Animation Director |
| Visual Effects | Klára Halasi | Animation |
| Visual Effects | János Hangya | Animation |
| Visual Effects | Edit Hernádi | Animation |
| Visual Effects | Tibor Hernádi | Animation |
| Visual Effects | Sándor Hirt | Animation |
| Visual Effects | Nóra Javorniczky | Animation |
| Visual Effects | Iván Jenkovszky | Animation |
| Visual Effects | Tamás Jónák | Animation |
| Visual Effects | Miklós Kaim | Animation |
| Visual Effects | Gabriella Kanics | Animation |
| Visual Effects | Magda Kecskés | Animation |
| Visual Effects | Ivan Kiss | Animation |
| Visual Effects | Istvánné Kuzma | Animation |
| Visual Effects | Mária Kálmán | Animation |
| Visual Effects | Mária Kárpáth | Animation |
| Visual Effects | Vilmosné Lõcsey | Animation |
| Visual Effects | Zoltán Madarász | Animation |
| Visual Effects | Gréte Máday | Animation |
| Visual Effects | Erzsébet Nyírõ | Animation |
| Visual Effects | Anna Orbán | Animation |
| Visual Effects | Géza Rosta | Animation |
| Visual Effects | Szabolcs Szabó | Animation |
| Visual Effects | Edit Szalay | Animation |
| Visual Effects | Andrew Szemenyei | Animation |
| Visual Effects | Csaba Szórády | Animation |
| Visual Effects | Sarolta Tóth | Animation |
| Visual Effects | János Uzsák | Animation |
| Sound | Bob Larimer | Songs |
| Writing | Bob Larimer | Lyricist |
| Camera | Mária Neményi | Director of Photography |
