Le Robot

Gohan awakes in the wilderness to find his tail gone and a new set of clothes on his back. But the puzzled boy has little time to figure out what happened before a group of wild animals try to have him for breakfast! The chase leads Gohan into the depths of an ancient cave, where he meets an old Capsule Corp robot. The robot has lived alone in the cave for over 30 years, and he's not happy to have visitors!

(Source : Kitsu.)