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In page Alfredo Castelli:

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In the same year Castelli began his cooperation with publisher Sergio Bonelli, writing stories for Zagor and Mister No. Two years later, he submitted the idea for a new series to Bonelli based on a New York researcher who investigated scientific mysteries: after two years of gestation, in 1982 he created Martin Mystère. The series, initially drawn by Giancarlo Alessandrini, marked a turning point in Italian popular comics history, introducing modern and sophisticated themes in a market dominated by traditional adventures aimed at a younger audience. Martin Mystère opened the door to many other new course characters, both from Bonelli and other publishers.