Defenders in issue #1 (Dec. 1971) and Marvel Team-Up, starting in March 1972, where he drew Spider-Man teaming with other Marvel characters. In 1973, he began his five-year stint as regular penciler on The Amazing Spider-Man, which at that point was Marvel's highest-selling monthly comic. Andru and writer Gerry Conway introduced the Punisher, who would become one of Marvel Comics' most popular characters. In 1976, Andru penciled the first large-scale comic book Intercompany crossover, Superman vs. the Amazing Spider-Man, in a story written by Conway and co-published by Marvel and DC. As one historian wrote, "The tale was written by Gerry Conway and drawn by Ross Andru, both among the few [at that time] to ever have worked on both Superman and Spider-Man ... The result was a defining moment in Bronze Age of Comic Books." Return to DC Comics In 1978, Andru returned to DC to work as an editor, a position he held until 1986. During this period his art appeared mostly on the covers of such titles as Action Comics and Superman. Working with writer Marv Wolfman and collaborator Mike Esposito, he co-created the syndicated comic strip The Unexplained in 1979. Throughout the late 1970s and the 1980s, Andru and inker Dick Giordano were DC's primary cover artists, providing cover artwork for the Superman titles as well as covers for many of the other comics in the DC line at that time. In the 1980s, Andru returned to interior artwork. He and Roy Thomas collaborated on the "Superman and His Incredible Fortress of Solitude" treasury edition published as DC Special Series #26 (Summer 1981). Pandora Pann was a proposed series by Andru and writer Len Wein which was to have been published in 1982. But other commitments prevented Wein from writing it, and the project was cancelled. In 1981, Andru contributed to the DC Super Heroes Super Healthy Cookbook, illustrating various Justice League characters as they explained food recipes to a 4th to 6th grade audience. Additional artists included Dick Giordano and Leo Durañona. Andru made a brief return to the Wonder Woman title, drawing six pages in issue #300 (Feb. 1983). The following year, Andru contributed to the 300th issue of World's Finest Comics as well. A New Teen Titans drug awareness comic book sponsored by the American Soft Drink Industry and drawn by Andru was published in cooperation with The President's Drug Awareness Campaign in