Immediate delivery recounts the misadventures of Feliciano Callosum (Cantinflas), a postman who is recruited by the secret counterintelligence service (called XU-777 secret agency), and must uncover an international conspiracy.

Fanny Cano
Bebe

Guillermo Zetina
Jefe de Contraespionaje

Emma Roldán
Doña Angustias

Quintín Bulnes
Agente

Carlos León
Agente