Ulyoth ambushed the Ghostbusters after they busted Arborak. Ulyoth disguised itself as a giant brick wall and forced Ecto-1 to crash into several trash cans. It withstood the Proton Streams by generating ectoplasmic shields, and countered with P.K.E. blasts. It then stripped them of their packs, immobilized Ecto-1, and proceeded to capture them. The Ghostbusters ran into a nearby building. As Ulyoth flowed into the room though the front door's mail slot, Egon Spengler trapped it.
- Energy Projectiles
- Ectoplasmic Barrier