Kúkan X daššucu (E18)

It is the day of the Ultra Guard's monthly exercises and Amagi and Soga disappear to a strange, alternate dimension. Though they are eventually able to make contact, the two groups of MAT agents soon discover that getting them back may be impossible. Commander Manabe recalls a similar situation regarding an "Alien Bell." These alien predators used a pocket dimension to capture prey. (Prime Video)