The strip focused on the title character, and his attempts to terrorize the citizens of his village, Happy Bunny Green, in a less extroverted, but more cunning way than that of Dennis the Menace. The citizens include Mr. Garden, his neighbour, Mrs. Garden, his wife, Mr. Baker the butcher and Mr. Butcher the baker, who are sworn enemies. He has a penchant for amazing ruthlessness. In one strip, he shows a cow a picture of a beefburger during a Cowpat Lottery (in which a cow has to defecate on a villager's selected square). In the Beano Annual 2009, he hijacks an anthropomorphic train, injures the driver, drives it dangerously, and eventually destroys it (a parody of Thomas the Tank Engine).The early stories featured a narrator, who spoke in a heavily sugar-coated way, but he disappeared during 2008.
His strip continued to appear regularly in the Beano until autumn 2009, when Laura Howell started drawing Beano Manga. As she was already drawing Ratz for the comic, Johnny's appearances became increasingly infrequent. He later made a return as a regular before the strip ended in 2010, after Laura Howell's strip Meebo and Zuky won that year's Comic Idol contest.