Léonard in French, and Leonardo in the Dutch translation, is a Belgian comic series about an eponymous inventor and his assistant.
Léonard refers to his younger helper as "Disciple" ("Lackey" in the English version), while Basile calls him "Master".
Basile shows, and not without good cause, little of the respect that Léonard feels due to him and their relationship is more one of squabbling worker and employer than that of pupil and mentor.
In fact, far from teaching his Disciple the ways of science, Léonard looks upon him as a convenient guinea-pig for his inventions and shows little sympathy when they go wrong, which they almost always do.
After being blown to bits or suffering similar injuries, the Disciple gets himself together and grudgingly proceeds to help build and test Léonard's latest idea.
Deciding that the town was not big enough for two geniuses, he and Léonard engaged in a fiery feud with both of them coming up with increasingly devastating methods to try to get rid of the other.
Running gags in the story included the angry inhabitants chasing both Leonardo and Albert out of town and both men joining forces on occasion to get rid of another passing genius, Nicolas Flamel, and his disciple.