Duela appears in the first issue of "Countdown". She abducts a teen celebrity from a nightclub, only to be stopped by Jason Todd. She claims that she comes from an alternate Earth. After escaping, Duela is killed by a Monitor, who states, "This world is not yours. Your presence in it is not tolerated. The penalty is death." When informed of Duela's death, the Joker says that he never had a daughter. The Monitor of New Earth suggests that Duela's father is actually an alternate version of the Joker, indicating "She didn't belong [...] making others think she was the Joker's daughter. Which on that world, she most certainly was "not"". Dan DiDio, editor-in-chief of DC, has stated that Duela's murder would have a ripple effect throughout the series. Nightwing, Robin, Donna Troy, Wonder Girl and Ravager set out to investigate Duela's death, but their inquiries are cut short by one of the Monitors, who diverts their attention elsewhere.