Ghostbusters Displaced Aggression

The Busters have been defeated by the pan-dimensional demon lord Kozar'Rai- Father of Gozer, and the villain has separated them across the time stream. Dr Peter Venkman is trapped in 1886, and his only chance to return to present-day Earth and free all of humanity from the Rule of Kozar'Rai has him teaming with a very unexpected ally.