After Doctor Strange accidentally botches a multiverse spell thanks to a very talkative group of heroes, the Avengers are violently displaced into an entirely different universe—landing straight in the Batcave. Mistaken for an invasion, Batman and the Batfamily confront the unexpected arrivals, forcing two of the most powerful superhero teams in existence to navigate mistrust, culture shock, and a shared mission to find a way home before the multiverse collapses around them.