History of The Menagerie

When the containment cells of the most dangerous creatures of The Menagerie were broken, the beasts and monstrosisties wrecked havoc on the remaining containment cells and scattered through the world's teleportation networks.   Within days, civilizations were in ruins, the gods sealed off the plane with their remaining power as their worshipers begin to perish, and the progress of humanoids was reset to nearly nothing.