400 issues in – that’s quite a milestone for Detective Comics, which was started way back in 1937.
For this monumental issue, Batman gets a new foe – Man-Bat!
Dr. Kirk Langstrom was a scientist who developed a serum that could give humans bat senses.
Hoping to cure his progressive deafness, Dr. Langstrom tests it on himself, but is turned into a ravaging Man-Bat.
Later, Batman and Man-Bat team up to fight off the Blackout Gang (first appearance), but their partnership is short-lived and Man-Bat mysteriously disappears.
He shows up later in DC #402 where he and Batman face off as enemies.
The cover of Detective Comics #400 is unique in that it features Batman, Robin, and Batgirl, where previous issues left out Batgirl.
Man-Bat may not be as memorable as The Joker or Bane, but he has become a lasting DC villain who still makes appearances today.
During the 1970s, Man-Bat was popular enough to get his own two issue series, illustrated by Steve Ditko.
Depending on the grade, DC #400 could be worth anywhere from $100 to over $3,000. The highest recent sale for DC #400 was $3,700 in 2013, which had a CGC grade of 9.8 (the highest grade for this comic).
Values of non-certified issues:
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