The Sea Scorpion is an antagonist in Primal Rift. The team first encounters the sea scorpion while trying to cross a strong current on the 4th floor.
Craig and team are unsuccessful at killing the sea scorpion due to it's strong armor. James manages to crack the sea scorpion's shell but not before the scorpion causes Dwayne and Craig to get pulled away by the current.
Later Craig finds James and it is revealed James continued to fight the sea scorpion but was badly stung.
Craig is attacked by the sea scorpion again while trying to install the UM Device for Dr. Singh. Craig attempts to fight the sea scorpion but is unable to harm it until Dr. Singh breaks the sea scorpion's shell with a shot from her magnum revolver.
The sea scorpion grabs Craig and pulls him into the portal. Craig uses his hunting knife to stab the exposed flesh between the sea scorpion's eyes. As Craig exits the portal the sea scorpion pursues but is severed into two pieces as Dr. Singh sends the shutdown command.