After investigating the Joker's whereabouts on the night of Nightwing's murder, Batgirl finds proof that he is lying about being his killer and exposes him. Meanwhile, Harley tries to talk to Ivy about her mental problems, but she is busy stealing the Legion of Super-Heroes' time sphere. Frustrated, Harley uses the time sphere so they can visit their future selves for advice, only to arrive to an apocalyptic Gotham in the year 2048. A group of survivors explain to them that a mysterious force caused Gotham's destruction in 2024, killing many residents including Harley and Ivy, and led to an adult Robin taking over the city. Harley and Ivy meet their future daughter, named after Neytiri, but she sells them out to Robin, revealing they were bad parents and a bad couple due to their lack of communication, which makes Harley and Ivy reevaluate their relationship. One of King Shark's adult children helps them escape and urges them to change this future before sending them back to their time. However, they arrive at the present six days after the apocalypse has already started.