Digimon: Digital Monsters (1999)

S1E24 No Questions, Please

Izzy finds himself ensnared in Vademon's pocket dimension, stripped of his natural curiosity. Meanwhile, DemiDevimon tries to negotiate with Vademon to purchase Izzy's Crest. Amid the chaos of their dealings, Izzy manages to reclaim both his Crest and the curiosity that had been taken from him.