If you're specifically looking for issue 18, your best bet might be to track down a physical copy through collector communities, libraries, or to wait for an official digital release. Always prioritize legal and official sources to ensure you're respecting the creators' rights.
Francisco Martínez Quijano, a Spanish cartoonist and writer, created Mortadelo y Filemón as a humorous response to the detective comics that were popular at the time. Quijano, who went by the pseudonyms "Pif" and "Paf", drew inspiration from classic detective movies and TV shows, as well as Spanish folklore and culture.
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"MORTADELOOO!" Filemón screamed, reaching for a nearby mallet. The chase, as always, had only just begun.