
Issue #41 of Batman/Superman: World’s Finest begins with Robin in a desperate escape from a horde of Bizarro clones. Fortunately, both Batman and Superman appear just in time to aid him, yet even the trio struggle against the relentless wave of Bizarro replicas of Superman. As they flee, Batman clarifies that the Dynamic Duo were visiting Clark’s Fortress of Solitude when a portal unexpectedly appeared and transported all three of them, with Robin being oblivious because he was preoccupied examining some peculiar mementos belonging to Superman. They were dispersed across the planet, which is not Earth but instead Bizarro World, a square planet created by Superman for Bizarro Number One and other Bizarros to feel at home. Unaware of who brought them there, the Bizarros are intent on violence.