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.

Cantinflas
as Feliciano

Gina Romand
as Carlota

Claudio Brook
as Alex

Fanny Cano
as Bebe

Guillermo Zetina
as Jefe de Contraespionaje

Emma Roldán
as Doña Angustias

Quintín Bulnes
as Agente

Carlos León
as Agente

Guillermo Rivas
as Espía

Jorge Russek
as Espía