Most of Shelton's subsequent work has been published by Rip Off Press. In 1971, Rip Off Press brought out the first collection of Freak Brothers adventures, gathering together stories and pages from over a dozen different sources and putting them between two covers for the first time. Another collection appeared a year later, and a third in 1973. That took care of most of the reprintable material, so the fourth issue, which came out in 1975, contained new stories. The 12th issue appeared in 1992 and the 13th in '97.
Early issues are now available in album form, and later ones are still in print.
In 1977, Rip Off Press started an anthology series, Rip Off Comix, where the Freak Brothers were a regular feature. That same year, Fat Freddy's Cat, one of the comics medium's more obnoxious felines, was spun off into a title of his own. In 1979, Universal Studios bought an option on producing a Freak Brothers movie. To date, no film version has ever been produced. The secret of the Freak Brothers' longevity is simple.