Dragon Ball Z S01E09 - The Strangest Robot

Sorry Robot-san — The Tears that Vanished in the Desert

Gohan falls into a hole in the desert and discovers a robot buried in sand in an ancient underground ruin. The robot tells him not to disturb its sleep, but Gohan, reluctantly, wakes it up again and again. As the robot looks after Gohan, it begins to get along with him.