S2, EP53 "Beneath These Streets"
After New York appears to suffer an earthquake, the ever enthusiastic Ray heads off into the sewers by himself to find out more; there, he learns that ghosts are gathering for a massive attack on the city.
S2, EP47 "Ain't NASA-sarily So"
A space station crew needs help with a power-sucking ghost.
S2, EP31 "A Fright at the Opera"
The Ghostbusters confront Valkyrie ghosts that have been terrorizing an opera house.
S2, EP27 "Venkman's Ghost Repellers"
The Ghostbusters encounter a swirling hole in the ocean.
S2, EP9 "Who're You Calling Two-Dimensional?"
The Ghostbusters are drawn into a cartoon world where they are called out to an animator's studio.
S2, EP3 "Ragnarok and Roll"
The Ghostbusters deal with a depressed man intent on bringing about the end of the world through what is know as Ragnarok.