S1·E10 The Rival Champions!

Arriving in the Lake Zone, Team Xros Heart quickly discovers that the Bagura Army is present thanks to IceDevimon's frozen victims. After rescuing a drowning Knightmon, Taiki and the others are introduced to the ruler of the castle of the Lake Zone: Persiamon. Meanwhile IceDevimon and his troops attack but when they fail and retreat, the general Lilithmon appears to take over. She then reveals the plan to thaw out a frozen powerful and dangerous digimon.