Riko and Reg climb down the Great Fault, using countless interlocking caverns to avoid the inhibiting madokajacks, large aerial predators that are reptilian creatures with an insect-like appearance. However, they stumble into a den of a madokajack, which forces Reg to use the Incinerator to kill it. Unfortunately, this attracts the attention of the crimson splitjaw previously wounded by the Incinerator. After narrowly escaping, Reg falls unconscious, leaving Riko to fend for herself...