Wally is sent to the North American forest to find out why a number of bats are suddenly sneezing after waking up from their winter sleep, as every C.L.A.D.E. agent, including Sam and Kit, has tail-itis, an uncontrollable tail disease. After a family of capybaras is bitten at a birthday party, Sam and Kit are sent to the South American jungle to find the culprit. They turn out to be lost army ants, but leading them is proving to be problematic.