If I had a Tail Hammer

'''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. '''

Summary
Ken finds a mysterious woman in his room, but she refused to tell him who she is. Meanwhile the Digidestined continue their cleanup. Davis realizes, Veemon can‘t digivolve. Kari and T.K. sneak off to see if their Digimon can digivolve but they can‘t. They wonder if the Control Spires are active again. Cody and Digmon are underground when Thundermon attacks them. Armadillomon digivolve to Ankylomon and emerges from beneath the ground. Then a mysterious Digimon destroys Thundermon and lands next to ken. He disappears. Mysteriously, the control spire they discovered had vanished.

Stat
Original air date: (Jap)    09/17/2000 	   (Eng)12/09/2000

Digivolutions
Major characters:- Cody Hida, Armadillomon (Digmon, Ankylomon), Ken Ichijouji, Wormmon (Stingmon), Thundermon.

Minor characters:-  Punimon, Davis Motomiya, Veemon (Exveemon), T.K. Takaishi, Patamon (Pegasusmon), Kari Kamiya, Gatomon (Nefertimon), Yolei Inoue, Hawkmon (Halsemon).

Miscellaneous trivia

 * The yoghurt Cody's Gradpa bought has the exact same package the prune juice had before.