I missed out on the Man-Bat stories when they first dropped on the stands decades ago, but soon I will have the chance to read them for the first time when the latest Showcase Batman Volume 5 arrives this month and includes the first three stories of the weird anti-hero.
It seems a goofy idea really, but it totally worked and Man-Bat became one of the more interesting characters at DC during the Bronze Age, at least in my meager opinion. Here are some of the earliest images of Man-Bat by Neal Adams. Here's a link to the debut story.
Man-Bat showed up again and again. Here's a look at the character rendered by his co-creator Frank Robbins. Here's a link to the story this page begins.
He even had his own comic book for a wee time. Here's a look at the debut issue, drawn by no less a light than Sturdy Steve Ditko.
Here's a gallery of Man-Bat covers.