Kitchen established a long-running relationship with Will Eisner beginning in 1973 with a two-issue series of reprints of the The Spirit. Warren Publishing soon launched a monthly Spirit reprint series, which returned to Kitchen Sink in 1977 (continuing until 1983).
Continuing their practice of collecting comic strips, in the 1990s Kitchen Sink reprinted volumes of Alley Oop, Flash Gordon, and Krazy Kat.