Zook is a fictional character that appeared in comic books published by National Periodical Publications (now known as DC Comics) in the 1960s. He was the partner of the superhero, J'onn J'onzz, the Manhunter from Mars (now known as Martian Manhunter). Zook's first published appearance was in the story, "The Invaders from the Space Warp" from Detective Comics #311 (January, 1963).Zook was one of four beings from "a parallel world in another dimension" whose first recorded appearance on Earth was on Jade Island (a fictional island whose location is unrevealed). They arrived on Earth via a space warp that was accidentally opened by a scientist from their world. Of the four alien beings, two were criminals (names of both unrevealed), a third was R'ell, who chose to pursue the criminals, and the fourth, who sneaked through the space warp after R'ell, was a Zook, a different type of being from the other three, whom R'ell called "a mischievous little animal".

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