Unlike the Ghost of Christmas Past, the Ghost of Christmas Present, and the Ghost of Christmas Future, Marley managed to avoid capture by the Ghostbusters and was only detected by the P.K.E. Meter. After Egon freed the three ghosts, he prepared Scrooge for their arrival by giving Jacob's warning, telling Scrooge he would be visited by the three ghosts.
A Christmas CarolEdit
While not much is said about the ghost, as he only howls as he leaves Ebenezer Scrooge's residence, it is known in the novel "A Christmas Carol," that Marley was Ebenezer Scrooge's partner who had died seven years prior. He came to Scrooge on Christmas Eve to tell him that he was suffering because of the sins he committed in life and that he would suffer the same fate if he wouldn't let three ghosts show him the error of his ways. His chains were meant to symbolize the wrongs he'd committed in life.
The P.K.E. Meter gets "strong readings" off of Marley. 
- On page 2 of Ghostbusters Issue #16, Jacob Marley's safe makes a non-canon cameo in the store display.
- On page 11 of Ghostbusters Issue #16, Jacob Marley makes a non-canon cameo as a doorknocker.
- ↑ The Real Ghostbusters Complete Collection Volume One Disc Five, "Xmas Marks the Spot" Storyboard p. 26. CPT Holdings, Inc. Line reads: "Jacob Marley (hideous moaning)"
- ↑ Egon Spengler (2009). The Real Ghostbusters - "Xmas Marks the Spot" (1986) (DVD ts. 04:31-04:35). Time Life Entertainment. Egon says: "Picking up strong readings from inside -- right there!"