After three nights in a row, coincidentally culminating on Winston Zeddemore's birthday, the Ghostbusters encountered Ghash, leader of a group of poltergeists. By feeding on the lesser entities, Ghash was able to increases his P.K.E. and gain the ability to roam. Due to a mishap at Winston's party, Slimer left the Firehouse and followed several entities to Ghash. He soon absorbed all of these entities to become unstoppable. The Ghostbusters adjusted their equipment to focus primarily on Slimer's unique frequency of 500,000 Mega Hertz and extract him from Ghash. They were then able to trap him and place him in the Containment Unit.
Ghash's demeanor appears to be an odd combination of qualities, such as Dracula, The Grim Reaper, and a wheat harvester.
When large groups of ghosts band together for threatening haunts and chaos, there is always one that stands out and leads the pack. Ghash had the proper personality and appearance for this specific role. Even though he was an evil being that cared for nothing more than immense power, he gave lost ghosts like Slimer a false sense of security and a feeling of being wanted.
AbilitiesGhash's signature trait was the ability to absorb other spectral entities by consuming them though a massive mouth in the middle of his torso. The more entities Ghash absorbed, the bigger and stronger he became. Once a ghost was inside Ghash, they would weaken as their powers were drained until there was nothing left.
After he consumed the other members of his "Ghost Gang", Ghash demonstrated his powers by shooting beams from his eyes and using his telekinetic abilities to control floorboards and disarming the Ghostbusters by removing their Proton Packs and tossing them to the other side of the room. Ghash also became a Roamer, he was no longer fixed to one location as a standard poltergeist is.
The name Ghash comes from the Storyboards and Script files for the episode "Slimer, Come Home" provided in Volume One, Disc Five of The Real Ghostbusters Dvd Box Set.