The Brave and the Bold #68

DC's 1966 team-up title brings together Batman and Metamorpho the Element Man in a genuinely wild premise, as the cover banner boldly announces that Batman becomes "Bat-Hulk." The cover, penciled by Mike Sekowsky and inked by Joe Giella and Murphy Anderson, depicts a massively transformed Batman — hulking, blue-skinned, and throwing a powerful punch at Metamorpho — while a gleeful trio of villains (including figures recognizable as the Joker and the Riddler) look on, taunting with cries of "Nice work, Bat-Hulk! Bye-bye, Element Man!" It's a vivid, kinetic Silver Age image that captures the era's appetite for outlandish hero-vs-hero action, and the spectacle of Batman's rogues cheering from the sidelines makes this a particularly memorable entry in the long-running Brave and the Bold series.