Agatha Armstrong and her trusty sidekick Mrs. Mac were once the world’s most daring adventurers. But when her son Ant came along, everything quickly changed and her devil-may-care ways took a backseat to being over-protective and terrified of anything that posed a risk to her family.

当一项大胆的任务开展时，深海潜艇队进入海底的一个神秘入口，进入后他们发现了一个失落的水下世界，并唤醒了里面古老的异世界种族。