Leopoldo Contreras, a professor emeritus of Roman law has serious economic problems. His translations of classical authors do not give enough money to live and had to sell even their floor. To remedy the situation is offered as a slave to a former student in exchange for room and board.
| Actor | Role |
|---|---|
 Fernando Fernán GómezDon Leopoldo Contreras de Tejada | Don Leopoldo Contreras de Tejada |
 Agustín GonzálezGonzalo Bárcena | Gonzalo Bárcena |
 Carme EliasMaría | María |
 Amparo BaróFelisa | Felisa |
 Mercedes LezcanoMargarita | Margarita |
 Manuel ZarzoClaudio | Claudio |
 Beatriz ElorrietaNot listed | Not listed |
 Manuel GalianaLuis Cuartero | Luis Cuartero |
 Manuel TorremochaNot listed | Not listed |
| TToa ToránNot listed | Not listed |
| SSandra MilhaudMirna Donald | Mirna Donald |
| BBárbara EscamillaAtocha | Atocha |
| VVanesa EscamillaAlmu | Almu |
 María BottoNiña (uncredited) | Niña (uncredited) |
 Joan PotauJaume Velat (uncredited) | Jaume Velat (uncredited) |
| AAna Díaz PlanaGallina (voice) (uncredited) | Gallina (voice) (uncredited) |