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.
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 $43,200 in 2021, which had a CGC grade of 9.8 (the highest grade for this comic).
Have this book? Click to appraise its value or Consign Yours for Auction!
Index to Key Issue Price Guides