When Marvel revealed its mysterious "MU" teasers were for something titled "Monsters Unleashed," the publisher remained silent on what exactly the project would entail. Teasers revealed that Cullen Bunn would be joined by artists Steve McNiven, Leinil Yu, Adam Kubert, Greg Land and Salvador Larocca for a new tale. Well, in addition to debuting a new promo image for the project by McNiven, Marvel has now offered up some concrete details for the monstrous new series.

"Monsters Unleashed" is Marvel's next big crossover event. According to Entertainment Weekly, every Marvel monster imaginable will launch an attack on our heroes with a grand "Pacific Rim"-style assault on the Marvel Universe.

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Marvel Editor-in-Chief Axel Alonso tells EW, "If there ever were a monster who stood 10 stories high or taller and created mayhem in the Marvel Universe over last several decades, they’re gonna be in the story."  

The promotional image from McNiven gives a first look at some of the monsters and heroes who will be mixing it up in the crossover. Monsters that normally fight on the side of good, like Groot and Devil Dinosaur, will be prominently involved in the event as adversaries. We even see Groot locked in battle against his Guardians of the Galaxy teammate, Rocket Raccoon.

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Bunn says, "It’s an all hands on deck situation. Imagine something like the Hulk, only much bigger. With the destructive force those creatures have, the heroes will have to mobilize much more quickly. The heroes find themselves very quickly in a situation where they have no downtime, they have no chance to take a breath. They’re moving constantly against what are essentially cataclysmic threats over and over again."

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To keep "Monsters Unleashed" new-reader friendly, tie-in issues will be kept to a minimum, and every issue will feature a different artist to speed up the publishing schedule. Each issue will consist of 30 pages, and feature plenty of splash pages to showcase the "Pacific Rim"-style monster mayhem.

"Monsters Unleashed" will be a five-issue series, shipping bi-weekly in January.