In quot;Four to Doomsday quot; Peter Davison s recently regenerated Fifth Doctor is burdened by the most irritating trio of companions in the history of the show (Adric Nyssa and Tegan) when the Tardis materializes inside a vast starship with a multiracial crew from Earth s distant past. Downloaded into computer chips are the memories of the 3 billion survivors of the Urbankan race and the Earth is to be their new home. Meanwhile Monarch a giant green frog-thing wants to travel back to the Big Bang to meet God who he is convinced is himself.