Premise: Madman is a creator owned fictional character, a comic book superhero that appears in comic books by creator Mike Allred and which has been published by a number of publishers over the years. The character first appeared in "Creatures of the Id" (Oct. 1990). His name, Frank Einstein, is a combination of Frank Sinatra and Albert Einstein, and is also a reference to Frankenstein.
Hypothesis: Madman was cancelled in 2015.