Detective Comics #261 (1958)

"Ah, Detective Comics #261. Now there's a classic piece of comic book history. This issue boasts the thrilling debut of Doctor Double X, a villain who surely gave Batman quite the run for his money. Not only is it a must-have for collectors, but it's also a thrilling read that keeps you on the edge of your seat until the very last panel. And, as an added cherry on top, it was even reprinted in The Batman Family #7, so you know it made waves in the comic book world. If you happen to have this issue in your collection, be sure to give us a call for a free appraisal or to sell your collection at a fair price. We here at Comics Into Cash have a reputation for being knowledgeable and trustworthy in the world of comic books, so you can rest assured that you'll get a top-notch deal."