Prior to 1995, there were theories — openly perpetuated by "The Simpsons" creator Matt Groening — that Casper was actually the ghost of Richie Rich, another character published by Harvey Comics.

including "Richie Rich," "Casper the Friendly Ghost," "Little Audrey" and more. "He was called 'The Machine' because he could come up with ideas very quickly," his daugher Marilyn Newman said.

12 x 18 in. (30.5 x 45.7 cm.) ...