The Iron Man comics perplexed the writers tasked with launching the MCU. 

If you're into superhero movies, you're probably aware of Marvel Studios' journey from underdog to titan. 

The ubiquitous Cinematic Universe began with the 2008 film "Iron Man," which was by no means a box office success; 

Robert Downey Jr.'s cameo in the film was hardly a return to form, and the film's title character was at best a B-list comic star. 

Even the film's writers weren't sure if it would succeed at first, according to the recently published behind-the-scenes ,

book "MCU: The Reign of Marvel Studios" by Joanna Robinson, Dave Gonzales, and Gavin Edwards. 

Their worries returned to the original text. "Demon in a Bottle" (written by David Michelinie, Bob Layton, 

and John Romita Jr.) is the most well-known "Iron Man" comic and tells ,

the story of Tony Stark's battle with alcoholism and eventual victory over it.

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