The Culculten are toad-like parasites that thrive in warm areas, able to spew foam from their mouths that induce a high fever in their human victims before laying their eggs in them so they can serve as both incubators and their offsprings' first meal. Three Culculten hatch, using the Sahara house as their base of operation and attempt to kill Kohtaro until Shigeru uses ice cubs to drive them off. When encountered again, the Culculten manhandle Kohtaro until he becomes RX to out-wrestle them before using the Revolcane to kill them each, with the effects of their foam waring off.