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

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