The Giant Armadillo was a mutation caused by nuclear testing at Area 51 in the 1950's. It burrowed out of its enclosure and began to run amok inside the walls of Area 51 and was mistaken for an alien spacecraft by two trespassers. This encounter makes it onto TV, and attracts the attention of H.E.A.T., who come to help the military with its mutation problem. It proves a challenge for them, as it destroys their jeep and begins to charge after them. They then formulate a plan to entangle it in the root system of a giant Mesquite plant, and are successful. The Giant Armadillo is then presumably transported back into its enclosure.
The Giant Armadillo can burrow deep into the ground.
The Giant Armadillo can curl into a ball to expose only its tough armor.
- The Giant Armadillo may be a tribute to Anguirus.