After the sinking of Atlantis, while the continents were still clustered as Pangea, the Hyborean age was home to Kull the Conqueror, Conan, and Red Sonja.
The Hyborean Age was home to the Druggie Wizard.
The party was thrown into the Hyborean Age, having imploded the portal on modern earth through which the apemen were invading.
Aslan, through Kane, predicted that we have a chance to stop an evil before it begins. They rescued the Mithra Tree guarding the Iron Book, and escaped back to their own timestrean with help from Blendin Blandin.