The series premiered in 1939.

The title character is the most mysterious character who has roamed the Disney universes. Mostly, the elusive man (with no known name) is seen in the mouse universe, where he has run-ins with opponents such as Mickey Mouse, Goofy (and Super Goof), and Chief O'Hara. Also, he often works with villains from the duck universe such as The Beagle Boys and Magica de Spell.
Blot is a criminal mastermind who likes a challenge, he is a master of disguise and escape, and he always signs his jobs by leaving a piece of paper with an inkblot at the crime scenes.

The stories were/are written by several artists. Examples: Robert 'Bob' Allen Ogle (1926-1984), Ivan Saidenberg (1940-2009), Paul Halas (1949-), Arthur Faria (1958), Carol McGreal (?-), Pat McGreal (?-).