Ice Ice Baby

Summary
Takuya and Koji unified spirit evolve to and  respectively and fight. They realize that their teammates are vulnerable without their Spirits, so Takuya takes them someplace safe while Koji holds him off. When Takuya rejoins Koji, they continue to fight and observes that Cherubimon's attacks have become unfocused; he takes that as a good sign. Meanwhile, Koichi is concerned for his brother, something that does not go unnoticed by Zoe. Takuya and Koji send Cherubimon crashing into the castle, which begins to crumble. The two save the other DigiDestined and flee the area.

Now safe, the children debate whether or not Cherubimon was defeated; Koichi says that he knows Cherubimon and that he is definitely alive. Zoe notices again that Koichi seems agitated and talks to him. Apparently encouraged, Koichi attempts to talk to Koji, but before he can, emerges from the depths of the castle and attacks. Bokomon reveals that IceDevimon slaughtered many digimon and took their data, making him so powerful that not even Cherubimon could defeat him. Instead, he was imprisoned in the castle until its destruction. IceDevimon begins to wonder if human data tastes good and when Takuya and Koji prepare to attack him, he freezes their D-Tectors.

J.P., Tommy, Zoe, and Koichi each spirit evolve into their human spirits and attack IceDevimon, but he then simply freezes and  so he can pick them off one by one. Tommy and Koichi both slide evolve to and  respectively, but IceDevimon becomes bored and traps Takuya and Koji in an ice force-field. As the ice begins to take hold, Koji pushes Takuya away to protect him and is attacked by tendrils of ice. Hearing Koji in pain, Koichi becomes angry and destroys the forcefield. Takuya immediately wants to fight, but Koji tells him that they'll only get in the way, so the two back off, leaving the fight in Koichi's hands.

Koichi and IceDevimon begin to fight in mid-air before JagerLoweemon is knocked to the ground again. Koichi then instructs Korikakumon to free the others. Beetlemon and Kazemon slide evolve to and. Korikakumon, MetalKabuterimon, and Zephyrmon all attack IceDevimon at once and JagerLoweemon delivers the finishing blow. He then slide evolves back to and scans IceDevimon. Exhausted, Koichi returns to his human form and collapses; Koji helps him up. Takuya exclaims that Koichi is definitely part of the team now, with Tommy agreeing. Koji and Takuya's D-Tectors return to normal, losing the ice that they were encased in.

The gang then notices Fractal Code glowing some distance away and it's revealed that Cherubimon has yet to be defeated.