You are travelling on a spaceship powered by the ""Improbability Drive"" - a one of a kind engine that uses the improbability of your entire vessel, and its occupants, dissapearing and reappearing at the exact location you program it to travel to. While escaping some aliens who want to read you their poetry you stumble across The Ruler of the Universe.
He appears to be an old man, living in a wooden shack on a small moon, accompanied only by his pet cat which he calls ""The Lord"". He spends his days messing around with mundane objects around his shack, or talking nonsense to his cat. After talking for a while you discover that he is quite mad, and unconvinced that anything even exists. Nonetheless his actions directly affects the events of the universe, shaping the lives of life-forms on trillions and trillions of planets. You try and explain this to him in order to convince him to rule more consciously, but he doesn't seem to understand, or believes you are a figment of his imagination, or perhaps simply does not care. It's very hard to tell. It's a very confusing meeting in general.
After some investigation you discover he is being kept alive in perpetuity by an improbability field similair to the one powering your ship, and that if you bring him aboard and send him away from the moon, he will become mortal and lose any influence over The Universe. Whomever is left on the moon will take over his position.