Cavity is a pastry chef-like monster in Sledge's ship sent to cause uproar in the populace of Amber Beach.
Cavity is voiced by Kelson Henderson who previously voiced Mig from Power Rangers Operation Overdrive.
Cavity was commissioned to prepare various cakes by Poisandra to sample to decide on which one to use for her wedding day. When she asks for a really nasty cake, so that people will remember her wedding day, he made one guaranteed to produce debilitating and extremely painful tooth decay. Poisandra tested this cake on Fury, with phenomenal results.
When Sledge discovered Cavity had been released, he ordered the monster to give the Rangers his new confection. Cavity immediately complied, going down to the Dino Bite Cafe, tying up the chef, and setting out samples of his decay recipe. Riley, however, quickly realized something was wrong when the customers were reacting in intense agony. With the Rangers spotting him at the counter, Shelby, Tyler and Koda helped untie the chef as Chase and Riley followed after Cavity. After a brief battle, Cavity was able to escape.
When he was later berated by Poisandra, Cavity got annoyed with her and transformed to a more vicious form, pushing her aside as he went on a rampage after declaring his loyalty to Sledge. He was confronted by Chase, who underestimated how strong Cavity's teeth were, and got hit with Cavity's energy blast, which began decaying his teeth. He would have been finished him off were it not for Riley's intervention.
Using a combo of both their respective Dino Chargers, Chase and Riley first destroyed Cavity's teeth and then the monster himself by Chase firing a combination of his Dino Morpher Blast (whilst utilizing the Raptor Charger's power). When Sledge turned him into a giant through the Magna Beam, Cavity was destroyed again by the Dino Charge Megazord's Stego Saber Final Slash.