Subway Ghost (Earth-8591)

The Subway Ghost was a ghost who escaped from the Ghostbusters after the Containment Unit was opened by Walter Peck.

Biography
After capturing Slimer and the Maitlands, the Ghostbusters encountered the Subway Ghost and locked him up at the Containment Unit in the Firehouse. After Walter Peck forcibly shut down the protection grid of the unit, it exploded the device, unleashing all ghosts that the Ghostbusters caught in New York City. The Subway Ghost flew to a subway to scare and howl at others.