Dragon Ball: Gokū no Shōbōtai
From Dragon Ball Encyclopedia, the ''Dragon Ball'' wiki
Dragon Ball: Gokū no Shōbōtai (ドラゴン ボール ごくう の しょうぼうたい, Doragon Bōru: Gokū no Shōbōtai; Literally meaning "Dragon Ball: Goku of Fire Corps") is a public service announcement film. It was released only in Japan in 1988.
This video is widely considered non-canon due to it not fitting in the Dragon Ball continuity. The main characters appear as firefighters and Bulma Brief lives in an apartment rather than Capsule Corporation.