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A trip to the U.S. put him in touch with Rip Off Press who published his Thunderdogs, comic book for the underground market; while Don and Maggie Thompson included him in their mini-comic series, for which he created Calculus Cat, and he later contributed to their Eclipse Monthly magazine.
Mavrides came to the San Francisco Bay Area in 1975, and was soon working with SF-based comics creator Jay Kinney on a weekly panel cartoon for the Rip Off Press, titled "Cover-Up Lowdown."