This Stan Lee figure is meant to be a LEGO Marvel Superheroes San Diego Comic Con Exclusive Polybag which includes a LEGO Stan Lee minifigure.
(This idea was created by a Wikia user by the name of George W. Lucas).
Stan Lee (born 28th December, 1922) is a comic-book writer, editor, publisher, media producer, television host, actor and former president and chairman of Marvel Comics. In collaboration with several artists, including Jack Kirby and Steve Ditko, he created Spider-Man, the Hulk, the Fantastic Four, Iron Man, Thor, the X-Men, and many other fictional characters, introducing a thoroughly shared universe into superhero comic books. In addition, he headed the first major successful challenge to the industry's censorship organization, the Comics Code Authority, and forced it to reform its policies. Lee subsequently led the expansion of Marvel Comics from a small division of a publishing house to a large multimedia corporation.
Where did the idea come from?
I've loved superheroes ever since I was a child, and especially liked Marvel Comics. I've also loved LEGO Since I was a child, so why not bring those two together? Stan Lee is one of the LEGO Marvel Superheroes who has never been made to an actual figure, so I thought it would be a good idea.
You can actually buy this custom minifigure made by Minifigures.com, here's a link: