Comicbook.com states that "Godzilla may be called the King of the Monsters, but he has had his challengers over the years. From Rodan to King Ghidorah, the kaiju has faced some serious threats, and it seems a new one is about to step to the plate"
"Over on Twitter, the first-look went live when Godzilla: Aftershock had a trailer go live. The upcoming graphic novel will be the official prequel to Godzilla: King of the Monsters, and its teaser revealed a new MUTO (Massive Unidentifiable Terrestrial Organism) joining Legendary’s MonsterVerse." Trailer available vie the below link:
https://comicbook.com/2018/10/29/godzilla-aftershock-new-monster-muto-kaiju/
"As you can see above, the new monster is seen fighting with Godzilla in an ornate ancient pictogram. To the left, fans can see Godzilla as he takes a hard knock to the chest. However, the figure on the right is the one fans have yet to see before."
"While the trailer shows a few more creatures in a montage, this never-before-seen MUTO seems be the clip’s focus. It appears to have multiple legs unlike Godzilla, and its long body ends in a pointed jaw or nib. Clearly, the unnamed MUTO has got teeth to it, and the pictograph indicates it has colored armoring around its torso."
(comicbook.com, 2018)