1x7 - Dragon Ball Z: Dragon Box

Gohan, having been left in a wasteland by Piccolo, is attacked by a dinosaur, and just in the nick of time, his latent abilities are awakened! He escapes to a high rock formation, but then is unable to get down again. Piccolo secretly watches over Gohan. Elsewhere, Goku slips on the Serpentine Road, and is nearly pulled down into Hell by the black hands that reach out for him.