Golden Age Origin
Spencer was a working stiff...er, ghost, who was supposed to scare people for a liv...well, that was his job. He reported to the ghost of a man named "Boss" who died in the 18th century. Spencer was not very good at scaring people, and lamented the troubles of being a ghost, but took solace in the fact that at least he wasn't alive.
Public Domain Comic Appearances
- Giggle Comics #21-99
- Spencer Spook #100-101
While Casper the Friendly Ghost made a book appearance in 1939, he did not hit the height of his popularity until 1945, sometime after the first appearance of Spencer Spook, which makes it unlikely that Spencer was an intentional rip off.