as his professional sidekick. Like his famous namesake, Groucho enjoys cracking puns and women, though he does not share his employer's luck with the ladies. Groucho's goofy, off-beat personality helps temper Dylan's moodiness. He also reminds his boss when their finances are in dire straits (almost always), shows up with a pistol in the nick of time and throws it in Dylan's hand right on time, and makes tea. At some point in every issue Groucho makes one or two jokes that annoy Dylan and the person listening to the joke (often a client of Dylan's). An example: "...once, I had a dog which could utter its own name. It was named Woof." Crossovers Some crossover stories combining Dylan Dog with characters from different comics were published, including, with Martin Mystere, Mister No, Ken Parker, Nathan Never, and Dampyr. In October 2019, DC Comics and Sergio Bonelli Editori announced a crossover series between Dylan Dog and Batman. Issue #0 of the crossover, titled "Relazioni pericolose" ("Dangerous liaisons"), script by Roberto Recchioni with art by Gigi Cavenago and Werther Dell'Edera, was published in December 2019. Cultural influence Italian author Umberto Eco said: "I can read the Bible, Homer, or Dylan Dog for several days without being bored." Sales Dylan Dog is the second most widely sold comic book in Italy (the first one is another publication of Sergio Bonelli Editore, Tex): including both reprints and new stories, it sells over 120,000 copies each month. As of 2017, the series has sold over 60 million copies worldwide. The series is also published in Croatia by Ludens, in Serbia by Veseli Četvrtak and Expik Publications, in North Macedonia by M-comics, in Denmark by Shadow Zone Media, in the Netherlands by Silvester, in Poland by BYM Projekt, in Spain by Aleta Ediciones, in Sweden by Ades Media, in Turkey by Rodeo and Hoz Comics, in Greece by Mamouth Comix, Jemma Press and Mikros Iros Publications and in Mexico by Panini Comics. English translation American publisher Dark Horse Comics released an English translation of a selection of Dylan Dog stories in 1999. This six-issue miniseries was later completed by a one-shot released in 2002. To avoid legal complications regarding Groucho Marx's estate, the art was altered so that Groucho no longer sports the Marx brother's signature moustache, and was renamed "Felix". Every cover in the six-issue mini featured art by American comics artist Mike Mignola.