Batman Day 2026: the facts nobody puts in the trivia lists

Batman armor cosplay, Dragon Con 2012. Photo by Andrew Guyton, edited by Hic et nunc, licensed CC BY-SA 2.0.

Yesterday was Batman Day, DC’s yearly excuse to get every comic shop on the planet to stock something with a bat on it. It falls on the third Saturday of September every year, which is why the date moves: 2026’s was September 19. It started in 2014 for Batman’s 75th anniversary, and it’s grown from a comics promotion into movie marathons, costume meetups, and midnight screenings.

Here’s what most “fun facts” lists about the character skip.

Batman wasn’t created by one person

Every cover says “Batman created by Bob Kane.” That’s the deal Kane negotiated for himself early on, and it stuck for decades. The character who actually showed up in Detective Comics #27 in 1939, cape and cowl and detective’s brain, was built by a co-writer named Bill Finger, who got none of the credit and none of the money.

Kane’s original pitch had no cape: a red suit, a domino mask, a pair of stiff bat wings copied loosely from the 1926 silent film The Bat. Finger is the one who swapped the wings for a cape, changed the color scheme to gray and black, and added the cowl. He also invented the entire secret identity. Bruce Wayne didn’t exist until Finger wrote him in.

The detective part was the point

Finger was reading Walter B. Gibson’s The Shadow pulp novels at the time, and it shows. The parts of Batman that still define him today, the obsessive investigation, the disguises, the idea that the real weapon is deduction rather than a fist, trace back to that influence. “The World’s Greatest Detective” is older than most of the gadgets people associate with the character.

Finger died broke, and got his name back only in 2015

He was credited on exactly two things while he was alive: two episodes of the 1960s TV show, co-written with Charles Sinclair. He died on January 18, 1974, largely broke and unrecognized. It took until October 2015, four decades later, for DC to put “Bill Finger” on a Batman comic’s creator credits for the first time, in Batman and Robin Eternal #3 and Batman: Arkham Knight Genesis #3.

What’s actually new this year

Batman Day 2026’s centerpiece is a one-shot comic called Batman of Two Worlds, out worldwide on September 19 for $2.99 at comic shops. A fitting title for a character whose own origin story has two very different authors and only one name on the cover.