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**Avengers #289**, titled "The Cube Root!" and published in March 1988, features the Avengers defending their Hydrobase headquarters against an assault by the villainous group Heavy Metal, led by the Super-Adaptoid. The team includes Machine Man, Sentry 459, and TESS-One. During the battle, the Super-Adaptoid accesses the Avengers' computer systems to locate the Cosmic Cube, ultimately summoning its sentient form, Kubik. The Super-Adaptoid then duplicates Kubik's reality-altering abilities, escalating the threat. Team:**- **Writer:** Ralph Macchio- **Penciler:** John Buscema- **Inker:** Tom Palmer- **Colorist:** Paul Becton- **Letterer:** Bill Oakley- **Editor:** Mark Gruenwald- **Editor-in-Chief:** Tom DeFalco
This issue is notable for the first appearance of Kubik, the humanoid embodiment of the Cosmic Cube.
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