Richie Rich & Casper #21

Harvey's favorite duo teams up for a Halloween cover that delivers just the right amount of spooky charm — Richie Rich, dressed as a little vampire, looks startled outside a moonlit castle while Casper floats protectively overhead, and the scene is populated with kids in devil and witch costumes alongside a genuinely menacing gargoyle perched on the castle wall. A carved jack-o'-lantern, swooping bats, and a full moon round out the atmosphere perfectly. The cover promises a "chilling Halloween adventure you'll never forget," and with Richie and Casper together for twice the fun, issue #21 makes a strong case for being the spookiest stop on your 1977 comics reading list.