In Augusta the emperor Caligula has a serious problem: he must demonstrate his manliness "coram populo" on the occasion of the feast of Priapus. But the Imperial young man is powerless and threatens a fool in front of the people who arrive in droves to watch the battle. To avoid this conflict, he goes to the professor Barnardus and attempts to hide out in his clinic.
| Actor | Role |
|---|---|
| CCarlo ColomboCaligula | Caligula |
 Gastone PescucciTiberius | Tiberius |
 Patrizia WebleyLivia | Livia |
 Enzo MonteduroCassio | Cassio |
 Silvio NotoSilvius Notus | Silvius Notus |
 Cinzia RomanazziLesbische Liebhaberin | Lesbische Liebhaberin |
 Fernando CerulliKerea | Kerea |
 Armando MarraServino | Servino |
 Mario MaranzanaDiogene | Diogene |
 Enzo SpitaleriNot listed | Not listed |
| DDomenico MaggioNot listed | Not listed |
| CCha LandresNot listed | Not listed |
 Donatella DamianiGirl bathing in the pool (uncredited) | Girl bathing in the pool (uncredited) |