While tracking Godzilla to Fort Armstrong, New Mexico the team discover that a gigantic mutated scorpion, called Ts-eh-go by the locals, is on the rampage. But when they try to contain the monster, they come under fire from U.S. military under the command of Colonel William Tarrington, an old friend of Hicks, who is out to destroy both Ts-eh-go and Godzilla. When H.E.A.T discover Ts-eh-go was created by the army's 'First Wave' program, and that Tarrington is planning to use the creature's offspring - codenamed 'Second Wave' - as bioweapons, H.E.A.T and Hicks must convince Tarrington to stop when the scorpions get out of control.