DuckTales: Infinity's Fallback

"I know where Dewey may have been taken to. A place called the Fallback dimension. A parallel word with doppelgangers that behave the exact opposite of us. Long ago there was a massive war that split the universe. Amos, the god of light and good, produced the Primeverse, the world where we live. But Katchella, the goddess of death and destruction produced the Betaverse, otherwise known as the Fallback Dimension. People there behave as your counterpart. If someone is pure and good-hearted here, then the doppelganger in the Fallback dimension is guilty and mean-spirited. Its a dangerous world outside the borders. But we mustn't wait, for Dewey's life, may depend on it."