Zudomon's Iron Hammer of Lightning Matt's group arrives on a snowy mountain where they stopped for a rest, during which Matt and Sora make arrangements on how to proceed. Joe, feeling left out, is cheered up by Gomamon. Mammothmon ambushes them, accompanied by several Frigimon. During the escape, Sora is partially frozen by an attack from a Frigimon. A reluctant Joe agrees to draw the enemy away while Matt gets Sora to safety. Finding themselves standing in between their pursuers and the others, a panicked Joe is reminded by Ikkakumon of Sora's predicament, prompting Joe to tell Matt to stay with Sora when asked if he need help. Joe's new-found determination to protect his friends no matter what triggers Ikkakumon's digivolution into Zudomon who defeats Mammothmon and the Frigimon. Once reunited and with Sora having recovered, the group departs on Birdramon again. Meanwhile, Tai's group travels through a cave only to find themselves in Tokyo, Japan.