In the vast multiverse, the mad scientist Grandpa Rick travels through time and space with unmatched intelligence and an unruly personality. But an accident during an experiment transmigrates him into the mysterious world of The Outcast. To his surprise, his brain development has dropped to zero, leaving him with the intelligence of an elementary school student. His memories, however, remain intact. Just as his life hangs in the balance, a System belonging to a four-dimensional being suddenly appears. Grandpa Rick can't accept being replaced by this four-dimensional being, despite how smart he is. With no other choice, he reaches an agreement with it: they'll cooperate and coexist, and his intelligence will be restored.
