Ep. 17: Hamtaro, the Super Sleuth!

17

The Ham-Hams' things are relocating themselves under Boss' bed. After Snoozer's pillow is stolen, Hamtaro eventually finds that the thief is Penelope, trying to put everything away in an attempt at responsibility. Meanwhile, Laura's things and those of her classmates have disappeared too, where the thief is revealed to be a bird. (Source: Wikipedia)