Daichi no Sôkô Ankiromon

Davis, Kari, and T.K. find that their Digimon can't Digivolve. Cody is attacked by Thundermon, leading to Armadillomon's unexpected digivolution into Ankylomon. Ken sees a strange woman in his room that won't tell him her name. When a mysterious digimon who is Stingmon, Wormmon's evolved form destroys Thundermon, it leads the DigiDestined to question Ken's behavior.