The Old One Cult is a secret society dedicated to the worship of the Old Ones.
When the Ghostbusters were set to appear in Dnepropetrovsk for a paranormal conference, the cult hatched a scheme to gain possession of "The Nameless Book" and awaken an Yibb-Tstll. Two members of the cult, Vladimir Pavel Maximov and Dmitri Smerdyakov, stole the book and accused the Ghostbusters. While the authorities investigated, Vladimir and Dmitri fled the Soviet institute and met with the rest of the cult on a mountain. They chanted verse from the Nameless Book and were taken to an underground temple. Once the book flew down to awaken Yibb-Tstll, the cult was exposed. When presented with this dilemma by the Ghostbusters, the cult ran away. However, they were rounded up and arrested by Police Inspector Faden.