Penny and Ace's secluded tropical honeymoon getaway is spoiled when Penny's vacation spot gets targeted for a major Explorers' Society intern group expedition! The island's newlywed bliss is broken by the sounds of superdimensional excavators and accidental portals spewing ancient horrors all over! Penny figures the only way to get peace and quiet back is to show the group of explorers-in-training how it's done.