The comic strip was first published in the Gran Pulgarcito magazine, issues #1 (January 27, 1969) to 23 (June 30, 1969).
[1] Professor Bacterio has created a sulfate intended to eliminates pests from the field.
However, the lotion has just the opposite effect: it considerably enlarges the animals, so it represents a serious danger to humanity.
Worst of all, a bottle of the sulfate was stolen by agents of the Republic of Tirania.
This album is drawn more carefully than the rest of the comics of the characters,[2] as they wanted to make it more similar to the French bandes dessinées.