Driver Gregorio del Prado and fare collector Regalito were suspended for deviating from their route to impress a young woman named Cholita.

Bratty rich girl plays practical jokes on the man that she'll obviously end up marrying.

Cantinflas is the apprentice of a renowned scientist, Prof. Arquimides Monteagudo (Carlos Martinez Baena). But Cantinflas has the soul of a poet rather than a serious researcher, and he wants to find the formula that achieves the immortality of the roses. Nevertheless, after the death of Prof. Monteagudo, Cantinflas will be chased by a ferocious corporative group, who wants to steal the secret formula of a cheaper fuel named "carburex", because they think that our friend is the only person who knows the composition