1x24 - Digimon: Digital Monsters

Izzy falls into Vademon's pocket dimension and is forced to give up his curiosity. Tentomon snaps Izzy out of his trance, but by that time, DemiDevimon tries to buy Izzy's Crest from Vademon. In the confusion, Izzy recovers his Crest and his curiosity as he causes Kabuterimon to Digivolve into MegaKabuterimon, defeating Vademon. Izzy and Motimon are found by Matt and T.K. soon after.