: The most famous official crossover is this made-for-TV film, where a time-machine mishap sends the Jetsons to the Stone Age and the Flintstones to the future. The Flintstones (DC Comics, 2016)
I notice you’re asking about “Los Picapiedra” (The Flintstones) and “Los Supersónicos” (The Jetsons) along with terms that suggest adult content (“xxx”) and a portable comic download. : The most famous official crossover is this