The Tangent Universe was pretty divergent from our world or the usual DCU, since Cuba and Florida were destroyed in a worst-case version of the Cuban Missile Crisis. 35 years later, New Atlantis was a thriving metropolis (not that one!) built out of Atlanta; and now home to new cop John Keel, and mysterious vigilante the Joker. Joker seems to be giving Keel the business, but lures him into giving chase, only to instead find midget mobster Doll Man and his thugs tied up and ready for jail.
Not letting it go, Keel tries to get background on the Joker, and from reporter Lori Lemaris he gets a couple of rumored origins for her, that probably aren't even close. He also tries Higher Atlantis University, where we meet meek Mary Marvel, mocked by a classmate as "girl of a thousand gimmicks." Then, wannabe cult leader Brother Power tries to preach the gospel of the Joker, who is not having it; and shuts down her prospective followers by asking them to follow her, as she leaps off a building.
Keel gets jumped by the Joker, and wakes up in a virtual reality nightmare, part-Joker, part family history: although he had been following orders, his father had been the soldier that launched the missile strike that destroyed Cuba and Florida. After the bomb goes up, Keel comes out of it, in Madame Xanadu's "VR-cade." But, when he catches up to the Joker, he thinks she might have inadvertently revealed her true origin: she was probably the child of survivors of the missile strike, who would have been severely irradiated. They're then interrupted by Doll Man's girlfriend and muscle, Big Barda!
In the end, Keel thinks he maybe understands the Joker, but also knows nothing; and the reader doesn't yet either! There's a brief peek at Joker's hideout, with masks that resemble Lori Lemaris, Mary Marvel, and Madame Xanadu; implying she was all of them. Which would make for a busy day! (No spoilers, but the sequel seemingly backpedals on that.)
The Tangent Universe was maybe DC's only fifth-week event that they ever revisited; and they still show up here and there. I don't know if this Joker is used much, though; since her cheerful anarchy is now 100% Harley Quinn's schtick, and Kesel has his own Impossible Jones too. (It's great, grab it if you see it!)
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