After defeating the metallic giant Sergeant Metallic, Goku enters a pitch-black room where he is ambushed by the "Messenger of Death," . Unlike the life-or-death battles Goku is used to, this fight is a comedic clash of wits and absurdity:
Murasaki attempts to use "expert" ninja camouflage, including hiding behind a transparent sheet printed with a rock pattern. Goku, unimpressed, counts to thirty before immediately finding him. Dragon Ball (Dub) Episode 37
If you were looking for Episode 37 of a different Dragon Ball series, the stories are quite different: After defeating the metallic giant Sergeant Metallic, Goku