A flea monster created by Finster, Fighting Flea could spread an itchy rash by biting his enemies. He shrunk himself and hid inside a stray dog Jason was taking care of, with Jason getting the rash. During a battle with Putties, Jason decided to spread the rash to the Putties. Some special chemicals were used to cure Jason of the rash. In battle, Fighting Flea could blast lasers from his antennae. He was ultimately exterminated by the Megazord's Power Sword.
He returned in Part 1 of "Ninja Quest" as one of the monsters who helped Rito Revolto ambush and successfully destroy the White Tigerzord and Thunder Megazord.
Notes
Fighting Flea comes from what is commonly referred to as "Zyu2" footage, and was not seen in the original Zyuranger.