Hitokuinuma no hitodama

Hito-gui-numa no chikaku de, kyodaina akai hikari no shūgeki ga aitsuide ita. Numa ni nanika himitsu ga aru node wanai ka to kangaeta ZAT wa, chitei tansa-ki perumidā 2-gō o hasshin sa seru. Kōtarō to Kitajima wa perumidā 2-gō ni notte chichū o hotte iku to, kaijū tondairu o hakken suru.

Attacks by a giant red light have been occurring near a so-called man-eating marsh. ZAT thinks there's a secret to the marsh and launches the Subterrene Pellumidar 2. As Kotaro and Kitajima dig underground aboard the Pellumidar 2, they find the monster Tondaile.