The Real Ghostbusters S06 E03 The Haunting of Heck House

"Who you gonna call? Ghostbusters!"

In flashback, the Ghostbusters recount their most dangerous exploit: the time they spent the night in Heck House, the most haunted house on the planet, inhabited by thousands of ghosts! For their troubles they are to receive a million dollars apiece, provided they survive the evening until dawn, without their Proton Packs!