The Brave and the Bold #28 features the first appearance of the Justice League of America. Almost as important, it features an awesome cover by Mike Sekowsky and Murphy Anderson of the JLA fighting Starro the Conqueror (also his/her first appearance).
Probably trying to capitalize on the popularity of television's The Monkees, DC created their own fictional rock band: "The Maniaks." With art by Mike Sekowsky and Mike Esposito, The Maniaks appeared in three issues of DC Showcase in 1967.