Mog, Garbo, and Mange are fishing for yabbies in the creek when a terrible monster comes upon them! When the petrified cats tell the gang about what they saw, Kevin and his friends laugh and tell them monster yabbies don’t exist, hoping to keep the existence of their mate Yabbo a secret. Meanwhile, Garbo forms an unlikely friendship with Yabbo and Mog sensing an opportunity tries to use their relationship to catch the giant yabby in a trap. Will Yabbo become lunch before the day’s over?