Fan Casting "mysterious alien monster discovered in the Hollow Earth" in King Kong vs Godzilla

APEX as well a shady partner named Bio Major decided to lead an expedition to the Hollow Earth and after entering in they uncover something unknown and yet old as well not from this world an alien like creature with an exoskeleton like an arthropod or insect but it had a beak and sailfins on it's back to help it fly in the air as well they to scythe like hook blades on each of its arms complete with a very technorganic body. the expedition as a twist is lead by a pair of mysterious unseen figures and who's backstory is never revealed to the public, the camera pans to reveal..... GIGAN