Harley Quinn #21
In "Right Back at Ya!", Harley Quinn faces a chilling new threat when Devani Kage arrives from the future, determined to stop her before she can kill Batman—only to discover that Red Tool was the first time traveler with his own agenda. Meanwhile, Harley Sinn has taken Madame Macabre and her son Mason hostage, setting off a dangerous chain of events. Written by Amanda Conner and Jimmy Palmiotti, with art by John Timms and Joseph Michael Linsner, and colored by Alex Sinclair and Jeremiah Skipper, this 2017 issue delivers a high-stakes, time-twisting showdown with a cover by Amanda Conner.
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Harley is challenged by Devani Kage, the second person to come back in time to kill Harley because it's believed that she will eventually kill Batman. It turns out that Red Tool was the first such person and he has his own plans. Elsewhere, Harley Sinn has kidnapped Madame Macabre and her son Mason.
Plot details indexed by the Grand Comics Database (CC BY-SA).